Nothing short of spectacular.
Like others stated, there doesn't appear to be any sort of solid melody through out, but that's fine, since it works for this particular piece. Interesting through out and incredibly hard hitting no doubt thanks to the impressive drumming.
The Hans Zimmer influence here is clearly obvious and, believe me, that's nothing but a huge compliment! What impresses me most perhaps is the sheer amount of stuff you've got going on at any given time in the mix. I'd be REALLY curious to see the project file for this particular piece, I bet the midi is a real mess ;).
This track kicked my ass all over the place, you've done an outstanding job.
Regards,
Daniel