I'd say that about Fantomas, and the live bootleg I have of Dave Lombardo, Mike Patton and John Zorn 9the most fucked up music I currently own). But Dave's drums in Slayer are not THAT challenging and hard. If anything, it's more about Endurance. once you learn to play thrash and at Dave's Speed, playing his stuff in Slayer is not that hard, although at the time he started, very innovative. But that said, his work in Slayer is some of his most impressive work.
That Drummer Guy Presents:
EVERY DAY from 4-6 am and pm on http://www.zeropointradio.com