I saw a lot of movies I really liked, but didn't see anyone mention Whiplash, which I thought was fantastic and might seem familiar for some skaters, coaches or parents (the 'do anything' drive for success).
Favorite really depends on the mood, for me.
Thinking/Drama: The Imitation Game, The Usual Suspects, The Hurt Locker, The Departed (just watched with my boys and they were mesmerized).
Action/Adventure: Gladiator, Dark Knight.
Comedy: In the Loop - definitely for adults, but a riot, s many little jibes.
Guilty Pleasure: Deadpool - a Marvel movies for grown ups (probably more guys than gals) who are jealous that the kids got all the cool superhero movies. See it at a theater with a crowd, it is as good as the trailers.
Sleeper (Unexpectedly good): Spy -I never would have thought to go to a Melissa McCarthy movie, but a friend dragged me and my 13 y/o son along, and now we can't wait for the sequel. She was absolutely hilarious and if you think Jason Stratham is just another talentless action flick sellout, his comic timing and willingness to mock and satirize himself might just make you think twice.
Super Guilty Reverse Cultural Awareness Favorite: Dale and Tucker versus Evil - If you are a misunderstood redneck (like me) and are tired of always being portrayed in the movies as uncultured, ignorant xenophobes, here is your hilarious revenge. If you are not a redneck, expand your horizons by checking out a typical back-woods, slasher b-movie from the redneck's perspective. Its not high art, it's just fun, so grab your popcorn and be prepared to laugh out loud.
I've just discovered this cute film and may have ordered the DVD 
