This is obviously a spin off of the last terrible movie you've seen thread...
Now for this thread, when I say great, I don't just mean a good movie, but something great, almost perfect in all areas; something I feel is as rare to find as a truly awful movie.
My most recent great movie experiences:
Matchstick Men: Loved the direction(couldn't believe it was Ridley Scott) and was really invested in the relationship b/w Cage and Lohman. Also has one of the most unexpected and cruel twists I've seen in quite a while.
Black Swan: Horrifying, powerful and completely captivating.
A Serious Man: The acting and writing is top notch. Simultaneously depressing and hilarious.
Pi: Probably one of the best Sci fi movies I've ever seen.