I know, we had another long rating topic, but it was a discussion before Cobalt got its own support-thread (product category).
So here is one of my comments as a feature request and idea.
There should be two rating-averages. One for the siteowner/Author, and another one for Users ratings. e.g. jReviews has this feature, too. You can also see it on most game or movie review sites. See screenshots:
Example3 - WordPress Rating Addon:
In general, the author has a special knowledge and opinion about the article. He does the main description and detailed review. Optionally, he does his final rating/advice. PS: I still think we need an extra rating field. That could be visible for Authors only. It could be added optionally.
After that, site visiters can rate the article or the review itself. (build-in rating)