I'm honestly not a fan of this kind of dubstep but I liked the song. The way way it builds up is pretty clever actually.
One thing i thought you could have done better is that you could have worked a little more on each instrument sound to make it sound a bit more soothing to the ear. Other than that i think your song was pretty good.
I'll give you a 4 :).
Oh and keep making ur music :). Listened to some of your other songs and I think you got a really interesting style that I would love to see you build on :).