Nice lists all around. I'm not sure I can really do the decade justice, as movies were my mid-to-late twenties to thirties things.
Ones that pop to mind off of the lists that I've seen and loved and are truly popular movies rather than haute or art cinema. I've looked at a few lists to crib and I really enjoyed:
Zero Dark Thiry
"What have you done here the past five years besides work on Bin Laden?"
"Nothing. I have done nothing else."
I'm not sure even the most overwhelmingly conservative or feminist movie could quite convey the bureaucratic desperation in the protagonist and deliver exactly how much of that she must have been feeling. Kathryn Bigelow is a modern master of character.
Birdman
You ####ers, I know he ####### slays the production and he lives.
Lego Movie
Everything is awesome. Everything is awesome when you're part of a team. Tegan and Sara just stole an otherwise deep, deep movie done by Clone High stalwarts and Jump Street guys. It could have gotten swallowed in deepness, but didn't. Bless them.
Everything in its right place
Guardians Of The Galaxy
I know everybody has a relationship with their mother, and that each is different, but I have a hard time thinking of life without her. What a guaranteed successful soundtrack/mix in every way, what guaranteed commercial tie-ins, what a wonderfully done movie, all against the backdrop of simple loss too soon.
One more, facing inward in the sculpted rock.
The Spectacular Now
It reminds me of me and my friendships in my mid twenties. They love you, but you don't know the dread you cause when you show up. That's hopefully over. What will my forties bring?