I'm giving it a 7 because I don't like death metal, and because the music often had trouble sticking to any few rhythyms, or indeed even the rhythyms it decided upon - they couldn't keep a steady beat. On the other hand, I could stand listening to it.
But 7 is damn good coming from someone who doesn't like death metal. I bet a hardcore death metal fan would probably give it a nine. If this death metal is good enough for someone who does not like death metal to be able to appreciate it, it's pretty damn good. Really, anything that can make someone who has distaste for a genre say "hey, that's pretty good" must be darn good to begin with.