I like the idea of a reminder screen for comments and reviews, that's a great idea. 

As far as basing any sort of QC process on a review and comments system though, I don't think that would work well for quite a few reasons.  First in order to have any value at all you'd have to know who is leaving the comments and reviews.

If the scammers can put poor reviews on good quality products to make theirs look better, and do so anonymously, you bet they will - which pretty much kills that form of QC real quick.  Without knowing for certain who is reviewing the product and why they are giving it a good or bad review it's pretty hard to judge the review's fairness and accuracy.