Well the year is over, and my personal favorite would have to be District 9. Very mature and engaging, and felt raw and real.

http://www.imdb.com/title/tt1136608/
http://en.wikipedia.org/wiki/District_9
http://www.rottentomatoes.com/m/district_9/

i saw hurt locker because of all the award buzz surrounding it. that's probably my fav.