While the main next-gen console version of the game is considered to be an all-time classic and helped revolutionize the online FPS genre, the lower-powered hardware versions were completely different games. While they share the same name, you wouldn't know these were Call of Duty games if you played them and no one told you.

Modern Warfare for the DS loosely follows the plot of the main game but instead takes liberty with its own unique levels and design choices. Obviously, we are working with barely better-than-PS1-level hardware here. n-Space really had to be creative and make entirely new games, mostly "themed" around the franchise. The game is still in first-person view, and you can switch between two different weapons. By default, you always start out with a pistol and another firearm. You can pick up weapons with the touch screen (a hand icon) and use that as your main weapon will not have any extra ammo available when you run out unless you die. When you die, you start out with your default weapons again and lose whatever you picked up, but your ammo is refilled. Weapons in this game feel decent, but the slowdown from the DS being pushed too hard (especially when enemies pop in) makes aiming a bit sluggish and janky. 

Aiming with the touch screen feels fine. Using the D-pad or face buttons to strafe isn't an issue either, but using the R or L button to fire can give you massive hand cramps even with larger DS systems. Most everything is controlled by the touch screen. Double-tap to bring up the ADS (Aim Down Sights), switch to grenades, and tap the weapon icon to reload. There are a few quality of life things that n-space did think of, such as when you reload, you go back to ADS if you are in that mode already, and spriting pulls you out of ADS mode. My issue with ADS is that while it's more accurate, there's a delay in bringing it up on screen, and that delay can cost you your life. When enemies pop in and the slowdown happens, it won't respond to my double-taps fast enough, and I would constantly bring up the ADS and back out a few times caused by the delay. It's not game-breaking, but very annoying.

There are two mini-games when setting explosives and defusing bombs. I found the pipe puzzles annoying, and following the wires to defuse bombs isn't really fun or challenging. These were just thrown in here to make use of the touch screen. Honestly, who wants to solve puzzles while playing Call of Duty? It's weird and just doesn't fit. It really breaks the flow of combat. The enemy AI is also pretty dumb. Enemies just stand there and shoot at you; don't take cover or move out of the way. This is literally an on-rails shooting gallery and is insanely linear. Levels are way too long, and some objectives have unfair checkpoint placements or none at all. Objectives range from collecting something to planting a bomb or just shooting everything in sight. I found the scripted mounted machine gun levels pretty fun, but the AC-130 level (similar to the console version) is awful and boring. You can barely make out any enemies, and you can't use larger weapons against smaller enemies. There are only a couple of buildings to blow up, and you just mow down dozens of enemies over and over again in almost complete silence. It was a bad level, for sure.

The visuals are decent for what the system can do. They are definitely sterile and boring to look at, with no artistic flair. The game tried capturing the hyper-realism of the consoles, and the DS just can't quite do this. It's a very brown and beige-looking game. There's no personality put into this game. It feels like a copy-and-paste FPS that you could attach any name to. Multiplayer is the same as single-player, but with another person. It's not very exciting, and your friends will get bored fast. I appreciate n-space for trying to capture the excitement of the console versions on the limited hardware, but it needs something else. Better enemy AI, less linear-feeling levels, more interesting scripted levels, and fewer storyboard-cut scenes. It's a great first start, but it has a lot of work before it becomes a staple DS shooter.