A "Star" rating system used to exist here at the Portal, but after a whole lot of complaints, and "much discussion":http://forums.obsidianportal.com/comments.php?DiscussionID=271 on the matter, Micah decided that a rating system was far more trouble than it is worth. In case you are unaware though, there is still a system in place to "Fan" a site that you like. On the right-hand side of campaign wiki pages there is a window called "Fans". Just click on the heart of any campaign that you like and you are now a fan.
I'm not a fan of having someone visit my campaign site and deciding that I'm only worth a 3 out of 5 when their criticism (or ranking, should I say), was not invited.
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Cheers,
-Arsheesh
But that's been gone over before, naturally.