I love the rawness of their guitar tracks more than anything. Drum sound is AWESOME, but their guitar tone is just so unique.
I think one of the things about their drum sound is that often the kit doesnt sound as you would expect a metal band's drum kit to sound.. For example, the kick from FMTS sounds quite round and whole, rather than a processed meaty sound with slap. Obviously they dont sound like your average rock band, but arent processed as extreme as a lot of similar bands...