I set up something like this on FaunaClassifieds a LONG time ago ->
http://www.faunaclassifieds.com/reviews/index.php
Been virtually unused. I doubt it would fare any better over here.
And quite honestly, such discussions will likely quickly develop into BOI like situations, which I would rather not have on this site.
So if anyone has such issues, please take them to FaunaClassifieds.