This was actually nicer to listen to than most amateur dubstep I end up hearing, mainly because it isn't just overbearing un-EQ'd bass from the drop onwards. You put breaks in every now and then between the basslines with synths, and I really like that. It's different.
Of course, there's always room for improvement though. You might want to make your kick heavier, and you GOTTA add some hats. The drum pattern sounds way too empty without them. The snare isn't actually that bad though. I usually prefer to hear a crisper snare that resonates more, however, though that's more of a personal standpoint if anything.
You might actually want to use more synths after the drop as well. After the drop, the entire song feels much too empty. Some pads can help with that, and a sub-bass would work out wonderfully too. Also think about volume mixing, as someone mentioned below. Sometimes, some of your synths should be way more quieter, or it just ends up sounding uncomfortable to listen to after a while.
It's not too bad. It's different than most, and that's nice, but you still got a long way to go. You have good ideas though, and I'd like to see those come out more as you keep improving (: