Pretty cool track, really Doom-y. The harmonisation's pretty cool, I thin if you humanise the midi a bit more it'll sound a bit less like MIDI, I find that you don't really want everything hitting those bars at exactly the same time because it takes the human element out and sounds a bit weird. Maybe add a little more overdrive to the guitar doing the first part, a bit of EQ on each of the guitar parts so they stand out from each other a bit more.
Cool track!