Sorry to say this, but this is my personal view, and I think some here in South America too, I hope!
Lamb of God - All That Remains - Mastodon - Shadow Fall - Pseudo Metal = Crap
Trivium - Rhapsody of fire - DragonForce - Children of Bodom - Edguy - Sonata Arctica - Music for Kids
The Gathering - Epica - Within Temptation - Lacuna Coil - music for Wimpys
Machine Head - P A N T E R A - Fear Factory is music for Fake (Hate me but is real).
The real metalheads, never NEVER leave metal, a true metalhead can hear everything, but can not like any music.
I prefer listening to a boring metal band, to hear CRAP. Slipknot SUCK!!
PS.for those who are touched by P a n t e r a, just look at his past, present and future, as Bully others, they did seem to Satyricon a band of fools, and Nocturno Oculto followed his game, I lost respect for all of them after that.