My pick would be Skyrim, as my character is already the max level after much, much training and boosting my skills, and I still have very much left to do in the game. The game pretty much just goes on and on forever so I will never be bored with it.
Skyrim Uncharted 3 Arkham City Skyward Sword Portal 2 Those are the only games I feel worthy of GOTY. Uncharted 3 is my GOTY, and it would've won much more GOTYs, if not for Skyrim, just like Uncharted 2 did in 2009.
Five years ago, The Elder Scrolls IV: Oblivion and The Legend of Zelda: Twilight Princess tied for GOTY 2006. In 2011, that tie remains. Your Friendly Neighborhood Satanist gives his GOTY 2011 award to both The Elder Scrolls V: Skyrim and The Legend of Zelda: Skyward Sword. They're just so good, and so equal in quality... it's too hard to call.