lol david - that sounds quite enticing - if you need it to be tested let me know as I would be very interested.
my thought was this: the author of the post is able to rate the review (obviously) and then makes the post. Those who comment are given a drop down menu which are numbered 1-10 (or whatever you decide to include as the allowed input) and the result is presented with single images representing the full count, so for example 4 stars or 5 stars below the users comments with the rating.
Of course it gets trickier when trying to get the average score of all scores so far.
Then I thought how about different images for each rating, or at least the option to do so - it could be design in the same was as the topic icon plugin - where a folder contains all the possible images required, and the rating could then be designated by number - so 1 would result in a turkey, 2 would result in an egg, 3 woudl result with a goat - you get the idea. But that's not important, if it can do stars that would be enough.
Perhaps the inclusion below the comment field with another text box with smaller text which would be a 1-2 sentence summary of the final thought.
Still looking for a competent and generic review plugin though, one that allow sthe inclusion of details such as author/artist/publisher/manufacturer etc - but I guess that could be part of a bigger plugin?