dubstep should consist mostly of electronic sounds. Has a poor melody and beat if any though and this is mostly due to the synth that you halfassed xD...sorry

constructive: try to make a custom wobble bass and not make the buildups so cookie-cutter, and for gods sakes don't have the synth doing a solo for like 30 seconds with that god awful sound.
Check out FL Studio Guru on youtube for some tricks if you don't already know. Good luck on your next song, check out my profile? I'll make sure to give you more rates in the future but i don't hold back :P