Guitar Hero 2
This game is worth the embarrassment of playing with a plastic guitar aged 25.
Orange Box
So much great stuff on offer here but Portal....wow, what a game.
Assassins Creed
I don't care what anyone says, I think this deserves to be nominated. The graphics blow me away every time I play it, the sense of space and attention to detail are incredible. I can see why the sci-fi storyline was used and I think it works well. The combat is brilliantly executed and the free-running/climbing is pure genius.