I dunno i'd say the greatest dubstep producers aren't those who can just make you pull the most contorted bass face.
Like when i first heard attack of the killer bass freaks i was like

it just was like a light switch went off in my head, that id been waiting all this time to hear those sounds. BUT i wouldnt say that effect lasts, you just go on searchin for the next big tune.
However, every time i hear Ruckspin and Quark - sunshine it moves me just as much, if not more, than the first time i heard it.
Same with Clouds - Shallow
Same with Bass Clef - Clapton Deep
Like i know as soon as i post this ill think of other artists that i would have said, but my point is is that imo the 'great' artists of the dubstep era will be those that pushed the boundaries of the sound, not just those who made the grimiest tunes -
Just for the sake of debate, that would mean for me that reso, bar 9 perhaps shouldnt be considered and more the types like Mala, Toasty, and Bass Clef. I think The widdler is a real anomaly in this discussion as in i dont think he falls easily into any category which i suppose makes him great anyway!