Metal has its flaws.
The basic concept of metal, or phrasal narrative melodic composition with Romanticist staging affirming a transcendental, holistic, immanent rationalism based in the objective affirmed by realism in a naturalistic context, is superior to mainstream music.
However, metal too can be taken over by this "rebel sell." The original idea behind rock music was a dual attack of authenticity/otherness that convinced teenagers rock music was "the other side" to the boring suburban lives that awaited them. That got sold out, and ever since, it has been selling itself out from within.
Since 1996, most of metal has been doing the same, dumbing itself down to three chords (not necessarily I-IV-V; more like I-II-III). If this site seems to overpraise certain bands (Summoning, Demoncy, Averse Sefira) it is because they are the few who have transcended this.