They really aren't mate. The whole metalcore thing does nothing for me.
Give me Candlemass, Destroyer 666, Gospel of the Horns, Obituary, Hail of Bullets, Secrets of the Moon. Old 80s/90s thrash like Metallica, Megadeth, Annihilator, Razor, Exciter, Sepultura too.
Well, I like ACDC; Iron Maiden, Metallica in their early days, and some power metal bands like Blind Guardian, pretty good, besides these ones I like old Black Sabbath, Motorhead, Rainbow, Ozzy in solo. And others. X)