Hmm not to sure what you guys mean by "mufflers" d: Do you guys mean compressors?
Anywho the song sounds like you put a lot of effort but there's always room for improvement (:
I think the drums are far too quiet and generic (for dubstep) look around for some better kicks, the snare wasn't bad but could use some body, maybe some verb too?
I thought the melody was nice just not developed, what I mean is you could expanded off that 4 bar melody in like the 2nd verse for some variety (:
The bassline notes are suuuuper generic, there's no problem with that necessarily, it's just been overused xD
The three things I really think you could work on are the transitions, the bass synths and your compression m8! Gotta get the compression down so your tracks don't sound so watered down!
Your transistions could use some work too, like in the beginning there was a piano then it just disappeared and was replaced by bass sounds which kinda threw me off. Also there was a defining build up for the drop which leaves listeners confused cause they didn't see it coming d:
What VST did you make the basses with? Keep refining them until they're super gnarly (:
Keep making music man! -Detious