The intro could use some work, starting with a high melody is a little risky, but it sounds pretty good with this song.
Hypothetically, what woud this song sound like if you raised the bass an octave and turned the melody down one? (try it out ^^)

Well sounds quite good, actually!
You are the first one who I rate in review the same way as I rate the submission. And that means that I have pretty much to say about improving.
So I liked the beats the most. They are lound, just as Dubstep requires it to be. The track is really multi-channeled and quite enjoyable.
Even though, what I didn't like was the "wub wub" thing. It's too, too sharp and hard. That is the main thing which made me vote the submission with 4/5.
As for different sounds... well. There was a bit of a lack at some part of the song.
Even though, the track is really progressive.

Well done!
4 Submission rate, 4 review rate.

Nice beats going on in this.
but you need to add more sounds.
It seems kinda repetative