Slayer & Mastodon were beyond incredible. Amon Amarth was great as well. Trivium are a bunch of poser losers - Matt Heafy is a pussy James Hetfield wannabe. Why does he have to "beg" the audience to jump up and down and scream? Is that maybe because they suck, and nobody would do so if they weren't forced? When you have to be told to be excited, your music must be too unoriginal and boring. Bring on the heaviest of the heavy and drop losers like Trivium. Bands like Mastodon and Slayer have weight that will withstand the test of time, I promise.