CoD4 only if you have LIVE.
Assassin's Creed and Mass Effect are the best imo. GH3 is more of the same, but still fun. Seriously though, Assassin's Creed is like my fav 360 game.
E92 335i: Space Grey|Coral Red|Aluminum Trim
Hold out for the BRZ STI or... Rocket Bunny FRS.