Not bad but here are the criteria:

Look at the waveform, its looking so straight all the time, that means its clipping (which causes the distortion). So next time make it quiter and dont overcompress.

Its kinda repetive and it doesn't really sound like dubstep, try to structure your song more (something like: intro, buildup, Drop, breakdown, 2.buildup, 2.Drop, outro).
Look sum tutorials for that

Mixing in this song is not so good, try volume-gaining (make each instrument as load as it should be, not everything on max).

And last one, this doesnt sound like dubstep, you need to make drum and bass the loudest (and you have synths as loadest instrument, but if you are doing melodic dubstep, it's ok)

Overall not bad, but try to do it to sound more like a song and not a earrape ;)

Actually not too bad for a start, but improvement well needed.

Cool