My top worst movies of 2013 are:

-Grown Ups 2
-Scary Movie 5
-Texas Chainsaw 3D
-The Internship
-After Earth
-White House Down
-A Good Day to Die Hard
-Elysium
-The Lone Ranger
-The Purge

Nice topic,
well one can't just choose one movie to be the worst in 2013
so:
1-Elysium
2-After Earth
3-The Purge
4-The Great Gatsby
5-Grown Ups 2
6-Beautiful Creatures

Top 5 but those movies are all equally bad, ugh
1) After Earth
2) The Mortal Instruments: City of Bones
3) Upside down
4) Kick-ass 2
5) The Family

1- After Earth
2- The Mortal Instruments: City of Bones
3- Upside down
4- The Family

The winners are
After Earth, Grown Ups 2, A Good Day to Die Hard

Elysium was the biggest disappointment for me. Probably not the worst movie overall however.

after earth is best

Elysium is the worst i have seen

My Regards