I love the idea of having one quick place to get a summary of reviews. One idea: Locally here I love the "quick reviews" on the theatreinchicago.com website which tells whether each review can be summarized as highly recommended, recommended, somewhat recommended, or not recommended. Of course it's an interpretation that's somewhat subjective, but it helps me whittle down my options in seconds and if I want more details, there's an option to read more. Sometimes I don't have time to read even the excerpts/summaries of reviews and a one/two word starting point is fabulous. You might consider adding something like that to your numerical categorizations at the end. (Personally I find it easier with words than numbers. By the way I assume you assigned those numbers? Might be helpful to add an "about" posting explaining your methodology.)
Just my layman theater goer's minor suggestions. I'll be sure to check this out going forward! I hope you link the blog posts here.