Yeah, I recall people complaining that he would tune down his floor toms to the same frequency as the kicks to make it sound faster I just went wtf, that doesn't make any sense...
I always thought their rhythm guitars sounded a bit sloppy though (but now when I listen to All Hope Is Gone I don't notice it anymore, I used to think Gematria sounded sloppy right of the bat...), up to this latest album anyway which is just tight throughout (I didn't really listen .5). I know they're good guitarists, so I just assumed they got a little lazy in the studio.
I really like that the guitars sound like people playing guitars. Funny thing with Metallica records, those old Pantera records as well, there is a raw quality to the best recordings where the talent of the players really shines through. But if you have a listen to Far Beyond Driven, actually there's some pretty ropey stuff in there at points! It just works cos the vibe of the people comes through hard. I only lump these three together because they're legendary, but Morbid Angel, too, a lotta guitar heroes, it's the human quality we really appreciate. On the new one, there's a bit where the rhythm guitar is solo'd and the sheer aggression of the playing is sick.
I believe they recorded the new tracks live in the studio, as a core anyway, and often preferred the non-click takes. Perhaps the performance is what they were going for. That's what the band says.