Honestly, I wasn't really that interested in them until a friend drug me to their concert. I usually listen to August Burns Red, I The Breather, etc.
AA doesn't dress like a bunch of fairies anymore, or at least they didn't when we saw them, and they actually put on a pretty good show.
Also, I simply love NZT48 by I See Stars. No idea why. It's just a cool song.
Trivium was pretty good, but they were a little full of themselves and far too showy with the guitars. "HEY GAIZ, CHECK OUT HOW FAST I CAN PLAY THIS SCALE!"
Motionless In White looked like a bunch of dykes, and the first thing they did was spit into the crowd. I fucking hated them.
Chelsea Grin is everything I can't stand about metal, so ugh.
Vanna was pretty good, but their sound people suck.
Crimson Armada was bad, sounded bad, and should feel bad.
There was some french metalcore band there that I didn't catch the name of, that was actually really good =/