10 - Wolfenstein
I really enjoyed this game, despite the lukewarm critical reception. Balanced multiplayer and a fun, albeit short single player campaign made this a good game.
9 - Bionic Commando
I know some of you guys aren't quite on the same page as me here, but I had a great time playing this game's campaign. Swinging around, shooting shit up is a blast. Reminds me of Spider-Man with a gun. Multiplayer Spider-Man with a gun, however, isn't as fun.
8 - UFC 2009 Undisputed
I'm not too big of an MMA fan. I enjoy it more than "professional" wrestling and the like, though, so I decided to give this game a try. I had a blast building up a character and kicking ass in single player. Then I could go into multiplayer and get annihilated! Some of the most fun combat I've seen in a fighting game.
7 - Guitar Hero 5
Under Pressure.
6 - Modern Warfare 2
God damn, did Infinity Ward strike gold with their addictive multiplayer. The campaign is pretty great, too.
5 - Grand Theft Auto IV: The Ballad of Gay Tony
This episode is definitely the better of the two, and seems like Rockstar's attempt to (at least slightly) bring the series back to its humorous, mayhem-laden roots.
This guy gives you some of the most fun missions (and hilarious cutscenes) in the entire GTA IV trilogy. That alone is worth my money. Arab money, that is!
4 - Trials HD
This LIVE Arcade game took me by surprise. I expected a cheap little clone of those flash games you see all over the internet. Instead, I got some addictive, hard-as-nails physics based gameplay. Throw that in with a level editor and you have one hell of a $15 game.
3 - Left 4 Dead 2
This one's been out only recently, but it's a huge improvement upon the first one. Instead of 4 campaigns, there's 5, all of which are very entertaining and have huge replay value. Versus mode is still a blast, and the new modes (Scavenge, Realism) aren't half-bad either. I can imagine playing this for months to come.
2 - Skate 2
This game is the best skateboarding game, bar none. Better than any Tony Hawk, better than Skate or Die, better than 720. A huge in-game map, easy to learn, hard to master mechanics, and user-created content galore make this one of my favorite sports games ever.
1 - Borderlands
Ah, Phantasy Star Online for the Xbox generation. I didn't really hear too much about Borderlands until its release. Once it came out, I decided to give it a shot.
Holy shit, it's addictive. It's a damn near perfect blend of RPG and FPS.