TL;DR If you're reading this, I'd suggest you just skip it and play something more interesting.

An ok co-op game if you get it on sale. Visuals put me off, especially the UI design. The gameplay is fine and the few bugs we encountered made the experience better. The lives system is completely unnecessary and just made the whole game worse.

A nearly perfect FPS game. Campaign is top-notch and the multiplayer is the best the series has ever had. The slower overall pace makes the matches a bit more tactical. Great maps and it's way more balanced than MW2 but the chaotic nature of that game might appeal more to others besides me.

The best GTA IV experience. Basically GTA 4.5 as it added mission objectives, an actually useful minimap, and batshit crazy missions and scenarios. Play the base game first and you'll appreciate this a whole lot more.