Pantera is popular because of it's importance, skill and heaviness. ANUS constantly bashes this band with little justification as to why, but more and more dogma and stubborness.
Skill is rarely a factor in popularity.
When did 'importance' become defined by Black Sabbath worship, meaningless guitar solos and the willingness to jump styles when it's apparent that there's more money in speed metal-styled alternative Rock than in glam metal? Pantera was, is, and always will be a money-grubbing operation.
American Black metal has more reason to compose works based on the desire for a challenge of the body and spirit than European black metal. European Black Metal is about accepting the challenges that the past has offered and reestablishing healthy, creative civilization.
American Black metal can be about finding the limits of a form when applied to a new physical or spiritual terrain.
While European Black metal seeks to create an ideal future though a restoration of an idealized past, Uniquely American Black Metal could address the creation of an ideal future through a communal journey of the physical and the spiritual.