I think we all have that crippling fear of not being good enough, so I doubt we, mostly, would agree with the rating system. Though, that system is used already, and It would, sort of, remove the basic purpose of Tapastic.
Not much of freedom, and In a way It would end up like most comic sites.
It would work, if you conduct a survey and figure out what the people are comfortable with, build a new system based on that old one.
Cool Idea though.