Slam death is the nu-metal of extreme metal, imo. Low brow, trendy, and comically macho. However, just like with nu-metal, there are a few acts that actually produce some decent music. Guttural Secrete, Cerebral Effusion, and of course Devourment come to mind. The song the op posted is horrendous though. And Origin is really fucking boring if you ask me. I prefer Suffocation, early Nile, Defeated Sanity, and Hour Of Penance for brutal death. I also suppose you could throw some of Decapitated's stuff and Decrepit Birth in with that genre if you wanted.