Speaking strictly from this game generation:
Crackdown
Microsoft decides to make a ridiculously fun sandbox game, but most remember it as the game that came with the Halo 3 demo. What the hell.
Batman: Arkham Asylum
The biggest step forward for action-adventure games in what felt like ages. Improved on nearly every aspect of the genre- not just combat, story, game world, or ridiculous set pieces.
Xenoblade Chronicles
I knew it would be good. I didn't know it would be mind-blowingly spetacular.
3DS Friend Code: 0645 - 5827 - 5788
WayForward Kickstarter is best kickstarter: http://www.kickstarter.com/projects/1236620800/shantae-half-genie-hero







