isn't it ironic how we complain that metal is often no appreciated by the mainstream yet when a metal band rises into mainstream popularity, they're instantly hated, called sellouts & no longer respected in the metal community?
^That's usually because to get to that point they have to change
Indeed it is; metalheads desire bands to continue on their uncompromising path while becoming popular simultaneously; in essence, I'd say Nile (while I don't particularly like them at all) are the first in modern metal to actually do this.
Okay, these are great points on this question, but what is really best for metal and the fans, in lieu of the original topic?
It seems that eventually all bands get to a point where they wish to change their sound (to fit their own needs), or to stay consistent. On one hand, you get guys like In Flames... who really didn't ask to break into the mainstream (or more like, "Hot Topic Metal"), they just wanted to change. Is that really something the deserve to be shunned for? (depending on if you ever liked them before) It comes to a point where, is the music really as watered down as we think it is, or are we pissed off because the kid in the Slipknot shirt suddenly enjoys it? We knew about x band for years, but y album comes out, and suddenly this faggot thinks it's great? You can't help but feel betrayed.
On the other hand, there is the consistency and what keeps it underground... which is (sometimes) paralell to stagnancy at this point. Bands like Overkill and Helloween keep going and going. There are rarely any surprises, but most of us like it, and prefer it to some new band in the genre. Then you have Anthrax, who, with every release, you just end up wondering when they're finally going to die or something. Few bands like these are branching out beyond new lyrics and artwork... so I think it makes them a little boring to some of us. In someways I think we're pointing the fingers at the wrong bands.
I don't ever want metal to be mainstream, even if it could be. I can't imagine being at a show, standing next to the kind of person (without harming them) that buys Britney Spears music. There are still a lot of people out there just on the edge though, the ones that just need the right song or band to come along and help them to the underground, and away from corporate radio. I'd like metal to reach those kind of people, at least. In America especially.