The intro is ok but I think it should be much better. Otherwise here the listener kind a wait until it's passed in order to get into business. I would let the two first repetitions the way it is, it would be your short intro, and then I'd follow with the same with a fast double bass drum and a loud growl announcing that the carnage has already begun.
The rest of the song is pretty good, to solos are among the greatest I've heard, and the rythm guit pattern totally unique.