My honorable mentions:
El Shaddai
It's so bizarre, yet so gorgeous. The very proof that games don't need to make sense to be great. This game also takes on a new skin when played in a theater setting. It's a visual delight and does not disappoint when it comes to gameplay. Simple yet difficult, and for heaven's sake you even play through the opening credits. It's a game made for people who love video games.
Child of Eden
I put this ganme on the same level as Yars' Revenge; timeless. And I love Bioshock, the entire series at that, but I'm a bit of a video game purist and love simple mind blowing concepts. Eden fits the bill. To quote my Father after watching me play the game "I don't know what I just watched, but it was incredible". That sums it up. No need for tutorials and thirty hours of play time as Child of Eden is Arcade action.
Sleeping Dogs
Yakuza themed GTA on steroids. So polished. So pretty.
Filthy at times and it does tend to pander to teens, but it is still so, so much fun. It has the unique ability go stray to the ridiculous, but then pull it back just enough to suspend your disbelief.
And I only own around one hundred 360 games, and haven't played half of them (which means the math is too difficult to manage

), so I haven't played even ten percent of the physical library. But I do know these titles stand out like a thug at a kanye concert.