Thanks for this. The value ratings will be great for the searcher but will they inhibit the poster who is afraid of getting a bad rating in public? I do not have the answer, just a question to consider in the design. When will the COP funcitons be ready?
Well, COP is beyond just ratings, but I think will be not so hard to make the end user to decide whether he want to be rated or not, etc, since it could be a stopper as you said.