There is some reason why you should use JLex Review ;D ;D
+ The guest can leave review
+ Create listing products and sort by rating point.
+ Review/Vote/Comment a product.
+ Anti review spam by reCaptcha
+ Multiple rating/multiple fields
+ Attach user's location, media (image, file)... to each review.
... and more.
(http://i.imgur.com/y4fXGh9.png)
Learn more in JED: https://extensions.joomla.org/extension/jlex-review
Demo for Content component: http://demo.jlexart.com/demo.php?alias=jlex-review
Listing component supported (Contact us if you don't see your extension): http://www.jlexart.com/documentation/jlex-review?p=setup/integration
Main page to download: http://www.jlexart.com/jlex-review
Thanks !