Interesting intro. I think that string synth probably could have benefited from more volume.
0:30 is a fairly new presentation style. I feel like we were really lacking the usual dubstep snare pattern there, and that would have beefed up the composition a bit. Also, section after was a very abrupt return to our intro.
The following build leads to a chorus that isn't bad but sounds like it belongs more in hiphop. Also, this track feels like it's totally lacking a bassline other than the drops. Drops additionally could probably benefit from coming down an octave. That's reeeeally high for a dubstep bass. I could play it on a trombone, without an F trigger.
I think everything roughly fits together. It's just there's no bass to give this track punch. Interesting writing, though!