Not bad for a first dubstep ever.
I've heard worst dubstep. As in dubstep that doesn't even have the wobble. Now that's bad dubstep. Now as for this track, work on the sound of your bass a little bit more, try using combinations of squares and saws and you should get a decent sound. Also try changing up the lfo rates in the song. You have it set to the same thing so the wobble never varies. Makes for rather boring dubstep to be honest. Just try and change up the sound and the rate at which the lfo is making the sound wobble and you should be golden for a second dubstep tune.