I'm not gonna let a bunch of fags (literally) diss Demilich while I'm alive and breathing.
Demilich do not have great production.
Demilich's vocals are average.
They're not fast
They're not horribly hard to play.
However, Demilich>every other death metal band for the sake that not everything fast and br00tal is good and that they had the guts to do something that was genuinely dark and fucked up, instead of the blather known as death metal and grind, which is more boring than anything Demilich ever did. I mean, if I wanted to listen to the sound of jackhammers, I'd listen to jackhammers. I listen to music for music, and Demilich are one of the few non-gaythenburg musical death metal bands with a clear sense of melodic direction and overarching perspective.
In short, progressive=good. Anything else sucks. I mean, you can try to be the fastest and the br00talest. But in 5 years, somebody's gonna be faster and br00taler. Then you're music is inherently worthless. But if you actually take the time to write good songs, then your music is timeless. Demilich is timeless.