I've only played one of the games on that list - Halo 4 - so I voted that by default. It's a good game.
I just haven't had time to play many games that were released this year. There's still a bunch of games from year's past that I still need to play. Case in point: I only recently bought Dark Souls and Fallout 3: GOTY because I was able to grab both for under $15. I still have Kingdoms of Amalur on the backlog too.
I guess the only other retail game I played this year was FFXIII-2. While a good game, it definitely doesn't deserve GOTY honors.
I started up playing Dust: An Elysian Tail after nabbing it from the sale a few days ago, and I must say, I am thoroughly enjoying that game to the fullest. Reminds me of the good old games. If Dust was an option on the poll, I would vote for that. Which reminds me that I have Mark of the Ninja on the backlog as well, after nabbing that too from the sale this past week.