Amazon.com is usually the first place I'll check to gauge consumer sentiment about a particular product. The review system is fine, and some people seem to rate every single item they've ever owned or have even just heard of, and I think it's usually a good place to get a broad spectrum of opinions. One major weakness is that Amazon does not allow a reviewer to change his or her "star" rating of the product after posting the review. Reviewers are able to edit old reviews to the extent of even deleting the entire thing and writing something new, but the star rating remains untouchable. I doubt many reviewers ever want to change a star rating on a review they've written, but it would be really great if the option existed. For example, I wrote a review of a car jumper pack, and gave it five stars after the product performed exceptionally well in its first three months of use. But later, when the product died a few days after the warranty period, I wanted to go back and adjust the five stars down a bit. I was able to add an update to the text portion of the review, but the 5 stars remain and are figured into the average rating that displays when a user is in "browse" mode. This issue can be particularly impactful on sales of niche products, since sometimes there are fewer than a handful of reviews. If a shopper decides to sort by average rating, he or she may never see a good product that has had a bad review that the reviewer later changed. If I hadn't already known of it and had a high opinion of it, I would've skipped right over the Intel DP55KG motherboard, which currently sits with an average rating of 2 stars. Nevermind the fact that the sole reviewer had updated her review to state that a problem had been fixed and that (s)he now thought highly of the board. (The reviewer wrote: " ... This raises my star rating to 4-5 stars for this product. (Wish Amazon would allow edits of the star rating as well as the text)").
This seems like a no-brainer. Is there some reason why reviewers should not be able to change star ratings, if they are allowed to change the entire text of a review, wholesale and without any notation?