Not really sure. Let me think, what did I play this year... Fire Emblem (eh), Metal Gear Rising (likewise), Monster Hunter 3G (maybe), Shin Megami Tensei IV (no), Project X Zone (hell no), Pikmin 3 (nah), Pokemon Y (maybe), Link Between Worlds (not quite), Ace Attorney 5 (not finished yet). At least I think that's everything I played. I might be forgetting something. I don't play most games the year of their release, so there were a handful of older games mixed in there that don't matter.
So for me, of the games I played, it's pretty much between Monster Hunter and Pokemon (both on 3DS). I also played Dark Souls for the first time this year, which makes this question even harder.
I asked one of my friends who played a wider variety of games than I did this year, and he said for him it's between Metal Gear Rising, GTAV, and Pokemon.
And by "eh" I just mean I don't really think it's GOTY material. I'm not saying I didn't like the game or I thought it was bad or anything.
On the other hand, by "hell no" I mean that I didn't like the game AND I thought it was bad.
