Not bad, but certainly not great either.
Melody is somewhat nice, the song has a decent beat to it.
The build-up is lackluster, the only thing that classifies it as one is the percussion, which is not enough if you want to build some sort of suspense to make the drop more exciting. You need to add like an upfilter thing to it, like you know, white noise or some synth that rises in pitch, pretty sure you know what I mean.
The next thing I want to point out is that the drop itself isn't anything interesting. The growl basses seem like NI Massive presets from 2012 (most of them sound pretty lame from that period by todays standarts and nobody thinks they're cool), the arrangement in the drop is pretty boring too.
The whole thing seems muddy.
In conclusion, I am gonna say that I liked the calm melody and the bassline (chords or whatever you did with that).
Yeah, pretty much. Just please don't give excuses like "Oh gosh diddly dosh, this is my first dubstep song therefore it's completely fine that it's bad", since you know, I'm not giving constructive criticism to flame you, only to help you fix the things that are wrong. Open to judgement, man.