I never got DFA1979. People keep telling me they are a) heavy and b) sexy. Both of these are such stupendously blatant untruths, Okay, I can see why they might seem 'face-crushingly heavy' if you'd never heard Electric Wizard, or seen Crowbar or Overlord* live, but I really, really, really do not get the sexy part.
I definitely agree with the 'all their songs sound the same' bit though.
*Both guitarists drop tune till they essentially play six string basses. I've seen 'em three times and never heard a single note. Brilliance.