This year's a tough one for me. So, so many good movies have come out this year. The Avengers, The Dark Knight Rises, The Cabin in the Woods, Wreck-It Ralph, The Grey, Looper, Skyfall, The Hobbit, I could go on.
I'm still gonna hafta go with The Dark Knight Rises as my favorite of the year, though. I think it's an absolutely spectacular film, and IMO is the first to break the curse of the third movie in a series bombing; in fact it's actually better than the other two films in the series.
Close second is Cabin in the Woods, though. I normally don't like horror films, but then again it's kinda not a horror film but rather a deconstruction of the horror genre itself.