There is an obvious gap between peoples stuff. When I post something I want to hear the truth, not a statement cushoined by my obvious lack of talent. I wanna be motivated by the truth. I can’t look at anything I do objectivly, its better than waht I made before but thats subjective and personal. I think if you named it “Harsh Crits” or "brutally Honest Crits "then people would know full well that they are gonna get the truth.
There would always be the problem of people commenting on stuff that might not need to be commented on…there would have to be very specific rules.
1.)No commenting on others comments
2.)No rude or abusive language, or comments directed at the character of the poster i.e. “you are a douchebag”
3.)The person being crtiqued should and must not take things personally
blah blah blah so on and so forth 
I think it would be good. I am seeing a sort of non interactive kinda thing though…just people posting their opinions…no talk or banter between people, just keep it simple.
“I think the back needs a lot of work, its really terrible, and get rid of that checker texture and the lens flare they are pretty lame these days, it screams amateur. Your muscles on the fore arm are wrong, here is a pic of the proper setup.”
then no more until the next update or whatever. NO talking about other peoples comments specifically i.e.
“Jack34 has his head up his ass, the hands are perfect IMO”
just a simple “IMO the hands are perfect…I would change blah blah”