Games that define last gen.

[amak11]

For me on a consoles at least

Wii: Super Mario Galaxy series, LoZ Skyward Sword, Kirby's Epic Yarn

PS3: God of War 3, Guitar Hero Warriors of Rock, Rock Band 3, and Red Dead Redemption, and Walking Dead the Game (Telltale games).

360: Halo ODST, Fable 2.