If that's any help once upon a time I designed a Module Review Report. It might be a starting point to design an application that would let people give their opinion on modules.

A general index listing categorized modules (that's easy, the namespace provides a convenient category) and the summary could link to the detailed report (which could be sorted on the various fields).

BTW I think it is important that comment authors be listed, as it prevents "ballot stuffing" and gives readers a way to evaluate the credibility of the rating.