Gravity is a MASTERPIECE and it was rightfully recognized as such by receiving 7 OSCARS, the only reason it didn't win best picture is maybe because its script wasn't really well developed(and the fact that it was basically a one "man" show) as it was mostly a movie about FEELING, the feeling of the amazing visuals and tension combined with a thrilling Score made out one of the most innovative films of the last decade + Cuaron's MASTERFULL direction is just sublime and unbeleivable
12 Years a Slave is a MOVING story, it was really crushing and vivid the way McQueen exposed this heartbreaking story and this is the kind of Movie Oscar Voters CRAVE FOR, the Bio Pics or the Human Struggles are basically the kind of films the academy rewards with the Best Picture OVER AND OVER AGAIN.
American Hustle is OVERRATED and is basically one of those films that got everyone a bit carried away by a GREAT CAST that delivered a GREAT PERFORMANCE but David O Russell's direction is quite poor and the movie lacks a Climax