It's decent, but some parts feel empty, especially transitions. You just need some perc loops or something, just to keep attention.
Then there's the noises in the drops. They're okay, but they're not very full sounding. My suggestion if you have an empty-ish drop like that is that you start layering like crazy. It creates really alien textures and it's super awesome. Of course, you need a bunch of wob samples to do that, so either make a bunch or buy a pack. If you want to buy a pack, you might want to check out Antidote Audio's Ultimate Dubstep Basses. 7 bucks for hundreds of super useful samples, can't get a better deal. Not sponsored. :p
But yeah, there's some problems that need fixing. Just keep plugging away at it and they'll get fixed sooner or later.