Nice wubbing, nice melodic progression in the intro. One concern, though—dubstep has drops in it, right? I couldn't clearly make out where the drop was supposed to be. At about 1:50? It could maybe be a bit more defined (and what happened to the wubbing at this point?)...
The wubbing comes back in at 3:00 or so, but that part feels like a buildup to a second (forthcoming?) drop. I guess the second drop would be at about 3:25?
The pads are quite pleasant, and give a really great atmosphere. I like the feel of the drums, though maybe they could be a touch louder.
Another breakdown at about 4:25. You bring in some vocals, and they're good but maybe could have been in the beginning of the track as well. Actually yes, I really like the vocals.
I would concentrate on structure with this track; it tends to wander without a clear direction. There's a lot of great material, though, so it's likely just a task of cutting and pasting and rearranging. Finally, the mixing was clear, no mud or anything, so good work on that.