Cowboys From Hell was a fine album, and I didn't really mind Far Beyond Drive, either.
I usually put thought into my posts, and they can be understood; I mean, why would I write something completely incoherent? But bias is sometimes blind to reason. I'll just take Malign Paradigm's post as an obligatory guiding point to all biased opinions.

Dimmu Borgir sell more records than Necromantia ever will, because they appeal to a wider subset of metalheads-which means they're crap because only the most seasoned metal listener will know to distinguish mass-made product from a true work of art. That's
just fancy talk, to be honest.
Both are pieces of music made to be enjoyed by those into extreme metal; whatever extra value one places on either comes only from the subjective view of the listener.
Last time I checked, there are also bands I don't like that are considered more "underground" than Dimmu Borgir so your point still sucks, I'm afraid.