Aesop posted something about not liking the transition between Slayer and Morbid Angel a little while ago over on Cosmic Hearse, but this is one of the stepping stones between thrash and death metal that is fucking gloriously excellent. There is an awful lot of palm-muting going on, and melodies have an awful lot of notes. At some level, I prefer the more distilled down, heavier material to come later, but there is something to be said for this fucking flurry. I can't even imagine recording the vocals on "Parricide." So many syllables.
Also, Pestilence use major thirds as a primary melodic vector, which is a sound that really grinds my goat off. (Megadeth and Merauder have also used this technique to great effect).
PS It's my birthday. Comment and make me happy, you fucking lurkers.