Hey guys can you please give this song a listen to and give me some feedback on it please http://soundcloud.com/nathan-roberts-1/dubstep-track
Your synth line at the beginning up until the first 'drop' isn't on beat at all. I would go so far as to say it's in a completely different tempo. Not a good thing at all. Also the second synth part for the second third of the song is sloppy. You can tell near the end where it seems you've mucked up a few of the notes, like hitting more than one key on the piano on accident. After the really lame drum roll going into the last third, I just stopped listening. If this sounds mean, it's because there's no use in sugar-coating criticism. It's bad.
This is a lot better than the stuff I was making when I first started out. Just keep practicing and making stuff and you'll get the hang of it. Your mixing needs some work and a lot of your notes aren't synced to the tempo.