I don' think it would be worth your time if it were a huge project. My assumption was that it might be fairly easy / automated to implement?
The VB forum that seems to do this well is "photography review".
AFAICT, every view you make after you post (but before the next person posts) is counted as one. I don't know if there are time restrictions in their code or not, but I like the way it works in general.
I think it results in a more accurate idea of responses as a percentage of views (or viewing "sessions" if you want to look at it that way), so you can know how members generally reacted without getting all the extra views thrown in the mix.