i am not really that well schooled on that genre, but things have caught my ears...

Heroin
Daughters, for sure, i saw them open for Cattle Decapitation, and they blew me away, the set of the night.

Plague Bringer is a really good drum machine, grind type band...

Cuddle, from Los Angeles, they are hard to describe, but really good.

on the more mainstream side, Cursive, as much as i HATE to admit it, that album, Domestica, really rocks... the drums on it are fucking great! so, for that, i guess they don't entirely suck.

I really like the the old grind, as far as this mathcore, screamo, i don't really get it... it's all emo, to me, the pop of today... they're are exceptions, for sure, (DEP, botch, more i am sure) like i said, i am no expert, just my two cents...