A band that I can't get behind, no matter what the song, is Opeth. I'm a metalhead, but they are WAY too growly.
Yeah, that "Damnation" disc is WAY too grindcore for me as well.
Sorry dude, but in Accordance to the Rules Of Metal, you are deemed extremely false. One does not dislike Opeth as a "Metalhead", and escape unscathed.
Most Metalhead's I know dislike Opeth because they aren't "heavy" enough, of course these are the sought of people who think "Apocalyptic Raids" or the "Pure Fucking Armageddon" rehersal tape are the zenith of metal or if you wanna quote that link "the ultimate".
You've got to be the first metalhead I've met with that reaction to Opeth..
The metalheads that call Opeth "too soft", are clearly the less intelligent, neanderthal breed of metalhead. And I say this in all seriousness!
I consider Opeth to be one of the heaviest bands in the genre, simply they take things down quite often. They have mastered dynamics in a really subtle and effective way.
The contrast between the quiet and loud parts is an effect in it's self, since you get lulled into a peaceful mood, and then BAM it goes all Death Metal on yo ass.
However, the quiet sections also have an emotional impact and sincerity, that is way heavier than all manner of blastbeats and manic screaming.
Heavy in the way that a Nick Cave album or the Cure's "Disintegration" is heavy. Nevertheless, their headbangy sections are still mondo kickass.
My point is, that blasting away at 240 bpm all the time gets really boring really fast, unless it's Hate Eternal or Nile, but even they slow it down every now and again. But that doesn't that we don't have kids who just want full-on grind all the time. I say let 'em :p
EDIT: Holy pretentiousness Batman! Oh well, I made my point.