Here's my ten favorites (as opposed to the best, necessarily) and five least favorites for the films of 2011. Keep in mind, there's plenty I haven't seen yet. Just throwing up the list for now; I'll come back with reasons later when it's not New Year's anymore.
10. The Girl with the Dragon Tattoo
9. The Muppets
8. Young Adult
2. Attack the Block
1. Red State
And now, my five least favorite.
5. The Green Hornet
4. A Very Harold and Kumar Christmas 3D
3. The Tree of Life
2. Cowboys & Aliens
1. Meek's Cutoff