Ok, so you've got some basics going, but your mix has a bunch of flaws.
Intro: The catchy melody gets my attention, but I'm a bit turned off by the distorted limiting. It makes the song sound uneven and somewhat unpleasant. I guess the only way you could fix that is by going to the bottom with whatever causes the noise (could be a result of exaggerated scooping).
Middle part or something: when the drums kick in I was also a bit ticked off. You seem to have placed the synths and the drums in the same frequency range. As a result, the two instruments are kind of different to separate from each other.
Easy solution:
- kick: boost the volume a bit, maybe sidechain the bass too.
- snare: (preferably) change the sample to something more punchy, boost the low mid freqs, add some compression and a tad of reverb. That way you might erase that sharp, biting sound that is created when hearing the synth and the snare together.
Maybe the mix is purely based on your own style, but from what I know of dubstep, the drums should be mixed way more punchy.
Anyways, keep it up.
//Kabalist.