I blame this game for spoiling me too much with its fantastic gunplay and animations.
An incredible stop-gap preventing Call of Duty from falling into complete mediocrity after the disaster that was Black Ops 4. The immersion factor is second to none and provides a fantastic 'tacticool' Tarkov style Tier-1 operator experience in a more casual package.
I really can't sing the multiplayer's praise enough as I have over 18 days worth of playtime last time I checked and almost failed a semester of college cuz I was too busy playing it.
What held MW19 back was its lackluster campaign, outright terrible Spec Ops mode, and less than stellar post-launch support due to Warzone's sad increase in popularity.
Had MW19 received more/better maps, guns, and a better campaign/co-op, it would easily be best of the best. But Activision can't help but ruin things as we've already seen with MWII.

I don't think we'll ever get another game quite like Battlefield 3. The style of this game is a rare treat, similar to Bad Company 2's grittiness but with it's own granular, CRT(?) style spin. While Battlefield 3's campaign is a nightmare to play with some awful scripting and many boring, drawn-out levels, the story itself is actually pretty good in my opinion and I sometimes replay the single player for that reason. Although I'll never get over how the game got downgraded from the Faultline gameplay demo they showed off way back when.
Multiplayer is stellar, of course, with the newly introduced assignments providing a very addicting grind incentive alongside the already present progression system and weapon unlocks. Vehicle balancing is overall pretty good, save for people that can go wild with Rocket Pod jets, and the maps are all fantastic, including the DLC offerings. Kharg Island in particular is an underrated gem that I'm surprised has yet to be remastered.
Co-Op is pretty lame tho, with sometimes even worse scripting than the campaign and no interesting story to keep you slogging through it. The helicopter and office shootout missions are the only real 'highlights' of the mode.

Battlefield 4 surpasses Battlefield 3 from a gameplay perspective but falls behind in terms of it's aesthetic, and single player offerings, as well as some frustrating multiplayer imbalance.
Battlefield 4 plays leagues better than BF3 does, with the game feeling much faster and more fluid than its predecessor. With more weapons, vehicles, and customization than Battlefield 3, Battlefield 4 is easily the go-to if you want to play a modern day Battlefield title. That said, you have to get around some of the more infuriating realities of multiplayer. Those being: vehicle mains getting 100+ kills in Attack Helicopters, Tanks, and Jets. The Mobile and Base AA are also problematic, with mobile AA having incredibly long range, and the AI controlled AA gun being easily exploited by lesser skilled jet pilots who can't win dogfights.
Battlefield 3 remains superior in terms of its gritty aesthetic and its single player offering. BF4's graphics often look too shiny and reflective compared to BF3's dusty feel. That and I prefer BF3's blue screen tint over BF4's piss filter. Battlefield 3's campaign also offers a better story than BF4's weird virtue signaling thing they had going on with Irish and Hannah's forced rivalry.

RATING BASED ON MODDED EXPERIENCE : https://youtu.be/U2QKt8BcV50
My rating for BFV is solely dependent on if you are playing it with Battlefield 1944 and other such related historical accuracy mods to vastly improve the immersive experience. Without these mods, BFV is more like a 5, but by making the game actually feel like the 'BF1 but in WWII' experience we were expecting it to be and what it should've been, it makes it almost surpass BF1 in some cases with the addition of crouch running, ledge grabbing, rolling, and other such movement additions.
The reason BFV still isn't a 5/5 with all these improvements is because support for the game has ended, and thus there are no Eastern Front maps, or proper late-war maps like originally intended had the game's lifespan been cut short.

A Halo spin-off that really deserved more. ODST is a great testbed for future games like it. Smaller scale stories about weaker protagonists that still feel impactful and engaging. ODST's shortcomings come from its short story, lack of replayability when compared to other games in the series, and less gameplay deviation from Halo 3 than there should've been.
While the 'open world' night missions as Rookie are nice when playing through the story as a whole, the game is lacking when you just want to play through some more action-based levels. There are only 7 or so missions that are actually combat focused. Granted, they are short and sweet with Uplift Preserve and ONI Black Site being the best of the bunch.
The other issue comes from ODST not feeling as 'ODST' as it should. You're effectively just a Spartan that can't jump as high and moves a bit slower. The fact that the game still lets you use super heavy weapons like the Gravity Hammer and portable turrets despite not wearing power armor further highlights this issue.
This is where modding and hopes for a sequel come in. Like with Halo Reach, ODST has a Realism Rebalance mod that makes you feel like the squishy human you really are. My idea for an ODST sequel would be to almost make it like an old school Call of Duty campaign where you feel like a vulnerable cog in the machine going to battle with other Marines and ODSTs. Give the animations the MW19 effect to make you feel more fragile and human compared to a Spartan and have bigger enemies like Brutes, Elites, and Hunters feel like actual bosses you have to exploit and fight

My first FPS and Call of Duty game, so I'm probably biased. The gameplay still feels very modern and fluid despite the game being nearly 2 decades old at the time of writing. There's a lot of missions which admittedly lack variety besides just shooting enemies and blowing stuff up. However, said shooting feels great that you don't mind doing solely that for the entirety of the game's runtime.
Where Call of Duty 2 improves over the first game is its larger scale, less scripted missions, more refined gameplay, and regenerating health as opposed to health kits. The larger levels like Demolition, End of the Beginning, and Hill 400 really makes the battles feel like the large scale engagements they were meant to depict, something that even current CoD games can't replicate.
The Back-2-Fronts mod really elevates the experience even further (even if it can kill some of the original vanilla style somewhat).

Classic Call of Duty peaked with MW2 in my opinion. The campaign is easily top 3 in the series; it's bombastic while also keeping some of the smarter elements of CoD 4's more realistic story. The soundtrack really elevates many of the more important moments to become some of the most iconic scenes in gaming.
The gameplay is probably the best that CoD has ever been in the Pre-Exo era with the game still feeling fast and snappy even without tac sprint and crazy ADS speeds like you see with the new Modern Warfare reboots. MW2 also has some of the best maps and weapons in the franchise (One Man Army not withstanding).
Similar to Call of Duty 2, MW2's success in my eyes comes from its larger scale 'sandbox' levels like Takedown, Wolverines, Of Their Own Accord, and Loose Ends. These missions provide a lot of enemies in large areas to really sell the scale of a large battle. The mission is also open enough and keeps the player in control for most of the experience while also progressing the story.
Spec Ops is also fantastic to play through with a friend even if MW3's co-op offering does overshadow it a bit in retrospect.

Treyarch's first real masterpiece. The campaign provides one of Call of Duty's best stories with enough fan service that calls back to Black Ops 1 without feeling forced in unlike Cold War.
Having the story jump between 1980s and 2025 provides fantastic closure with Black Ops 1's characters while also giving them purpose in helping out new fan favorites. Black Ops 2's story also has branching paths and CoD's best villain to date.
The multiplayer is peak, even though the Pick 10 system feels a little restrictive as time goes on and the SMG dominance is still very prevalent. (And I'm still salty about the M8A1 being burst in MP despite being full-auto in the campaign)
Zombies has a very weird disparity in terms of quality. Tranzit and its sub-maps are serviceable at best, and Nuketown is a fun bonus. Die Rise has some neat moments but doesn't really satisfy due to its small size which can also be said about Buried. While neither of these maps are bad by any means, they don't compare to the heavy hitters that are Mob of the Dead and Origins which are the two DLC maps you should really buy over any of the other ones.

Easily one of the most atmospheric games ever made. While the gameplay is far from being authentic to WWI, the game's Codex and attention to detail shows that DICE still wanted to respect the era depicted while at the same time keeping the game fun. That said, some of the balancing is a bit off with Assault getting most of the best weapons and anti-vehicle gadgets. The Heavy Bomber and Artillery Truck are also quite problematic.
Mods are also recommended to change up character skins and add realism

Battlefield's best campaign to date along with fantastic multiplayer and peak sound design/gunplay impact. While the movement feels a little clunky nowadays with a lack of diagonal sprinting or going prone, the gunplay is so satisfying that it doesn't really matter.
The campaign's globe trotting, almost Indiana Jones-style story is accompanied by a great soundtrack. The missions are well scripted and fun to blast through combined with entertaining well written characters.
Multiplayer is also top notch but unfortunately suffers from low player counts populating monotonous 24/7 servers. Thankfully the campaign can continue to provide entertainment even after the multiplayer's glory days have ended.