Why is it being "mature" an issue? If a game is fun, a game is fun, it doesn't really matter whether you can behead hookers or jump from platform to platform. Play a good game, because it's good.
My Games of 2011:
The Legend of Zelda: Skyward Sword
Elder Scrolls V: Skyrim
Super Mario 3D Land
Uncharted 3: Drake's Deception