GD Star Rating is post, page and comment rating and review plugin for WordPress. Plugin supports different image sets, rating moderation, vote rules, time restricted voting, templates, trend calculations, multi ratings, templated rendering, has a widgets build in and extensive shortcode support. Plugin can be integrated with comments for making a review website.
Plugin support for comment integration for setting up the review based website. Also, you can reorder posts using rating results fro archive, front page or anything else. Plugin is fully compatible with all major cache plugins (like WP Super Cache), and ratings can be loaded dynamically and ratings will not be affected by the cache. For the most part, plugin is compatible with WordPressMU.
Plugin is provided for free, and that is not going to change. But support is not free anymore. Currently available tutorials on official website will remain there, but all new tutorials and much more are available only through premium support on Dev4Press website.
More info: http://dv4p.com/i6