With GD Rating System Pro you can give your website authors and editors ability to add review ratings for the review posts (reviews for any product type). For this purpose plugin includes Stars Review and Slider Review methods. Review is configured through the meta box on the admin side post edit page.
For review purpose plugin implements the settings for the reviewed item, so you can include various product information, and to include all the review related information in the review rich snippet.
This demo website contains two example review pages, one using Stars and other using Slider: