You guys are completely comparing apples and oranges. Mastodon and DEP have *very* little in common with Converge. Sure, if you judge the music solely on "technical proficiency" other bands will win out. Either way, it doesn't matter. Opinions are like jerks (as we all know, the hardcore scene is chock full of 'em).
It's always a relief to hear genuinely dark music that isn't infected with a bunch of Iron Maiden riffs played in reverse.