Sounds good, but it's kind of generic. Could use some personal touch. A guitar part, perhaps? Or at least some fx, ambience or vocal samples. All in all - not bad for a first attempt. On the other hand - dubstep's a bit played out at the moment. Might be a good idea to think in terms of expanding and evolving the genre.
"The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one." - George Bernard Shaw