My game of the year will be a RPG game like last year (2011 - Skyrim).
Although the game is completely different I still love it and it is the game I have enjoyed most in 2012. My Game of the Year is Mass Effect 3.
The reasons for me to choose ME3 as GOTY are many, but my biggest is : The continuation of Shepard's story in the Mass Effect universe.
If you look at the story, the conversations with your squadmates, the environments and the overall mood you just get the feeling that the universe is at war. And I love it. The game just sucks me in, and to make it even better I could import my Mass Effect 2 save game so the choices I made in part 1 and 2 still carry over.
I know many people have been complaining about this game and call it the worst game ever (exaggerating here) because of the ending but I really had no problems with it and even after the EC DLC it became good.
So although games like FC3, Hitman and ACIII come close my GOTY is Mass Effect 3.