I think this a really neat loop. I'll actually put it on loop for a minute while I review this.
I'm not really sure if I'm right about this... but I feel like you should have some sort of background chords or something to fill the slight emptiness in it or something. I don't know, maybe dubstep doesn't do that.
I like how you did this though, man. I wish I knew how to make dubstep, I'd try to make something similar to this.
Drop me a review if you find the time!
(E-E)