I clicked on the stars below the model because I thought it would lead me to a rating pop-up or page, but instead it accepted the click as the number of stars for the rating. It would be preferable to 1) have a clear and distinct rating page or process and 2) be able to change one's rating.
I've been bitten by the same problem (accidental click on wrong star, and you're stuck giving someone the wrong rating). I'd also like to be able to change my ratings. Thanks for listening.------------------
Elytra on Shapeways: http://www.shapeways.com/shops/elytra