It's definitely not bad! I think if the drums were actually a little bit more defined and louder at the beginning, that'd be good, but yeah for a first shot at dubstep this is pretty nice! Well done!
ok so the intro is absolutely amazing but at 22 when it kinda sorta drops it shouldnt be focusing on the background sounds and more towards the dub itself either then that its great:) P.S. this is just friendly advice dont take it the wrong way cause it is very good