A friend and I had a disagreement over it. See, he says it's not Real Metal™. Real Metal™, or Manly Metal™ is thrash metal. According to him, that is. I've moved past my ninth grade obsession with thrash metal, which can be exemplified by such stellar bands as Dragonforce.* Of course, once I started getting interested in classical music theory, thrash metal no longer cut it for me. I slowly realised that if you listen quite carefully, some bands actually do use some music theory in their compositions (Think middle-late Metallica, for example, or Black Sabbath's Children of the Sea, for a more specific example.) A good melodic riff has to be carefully written, not just 'hammered in'** kind of randomly. That's probably part of the reason I never developed an interest in pop music, but secretly kinda like metal before it even developed into an actual love of it. But I expect at least someone to come and call me a typical music snob and that I don't know what I'm talking about/reference the wrong band/doesn't know anything about writing guitar music, etc. etc, etc.
*Youtube a certain interveiw of theirs for a specific example.
** or "H-H-h-hamma it it", as Dragonforce put it. You should be noticing a pattern here.