1. GRAVITY
2. MONSTERS UNIVERSITY
3. OBLIVION
4. SIDE EFFECTS
5. THE CROODS
Filling it out to five was tough. Other than GRAVITY, which was phenomenal, the others are less favorites and more "eh, worth seeing at some point." Honorable mention to THE WAY WAY BACK, CAPTAIN PHILLIPS, and, bizarrely, WORLD WAR Z. THE WOLVERINE and CATCHING FIRE are also watchable but take-or-leave.
There are a number of movies released this year which I have yet to see but I hope might change my list a bit once I do, based on their word-of-mouth:
MUD
ALL IS LOST
THIS IS THE END
EUROPA REPORT
PHILOMENA
12 YEARS A SLAVE
AMERICAN HUSTLE
PRISONERS
KILL YOUR DARLINGS
DALLAS BUYERS CLUB
I watched an hour of UPSTREAM COLOR and gave it up for garbage. I found PRIMER to be fairly insufferable too, though, so I just don't vibrate on Carruth's wavelength like everyone else seems to.
If what made DRIVE interesting is a steak, ONLY GOD FORGIVES is the roadside diner challenge where you have to choke down a triple-sized steak in one sitting.
Worst of 2013 for me -- too many to name just five:
ELYSIUM
THE GRANDMASTER
GANGSTER SQUAD
HANSEL & GRETEL WITCH HUNTERS
OZ THE GREAT AND POWERFUL
JACK THE GIANT SLAYER
IRON MAN 3
MAN OF STEEL
PACIFIC RIM
THE WORLD'S END