Lets see:
Borderlands, Gears of War 1 2 and soon 3, Team Fortress 2, All Half-Lifes, Skate 2 and 3, Bulletstorm, Portal, Splinter Cell: Conviction, Assassin's Creed 2 and Brotherhood, All Legend of Zelda games, All super smash brothers games, All StarFox games, Starcraft 1 Brood Wars and Starcraft 2, Minecraft, Killing Floor, Just Cause 2, All Pokemon games (Except Ranger), CounterStrike 1.6, Crysis,
LIST GOES ON. There is no way for me to pick my absolute favorite.