DJ-Reviews is a rating and reviews extension. You can create your own rating criteria (with weights) for various content types.
It is already integrated with Joomla content, DJ-Classifieds, DJ-Catalog2 and J2Store (more will come soon).
This extension let’s you create different rating groups (each group can be assigned to different extension and have different rating criterias).
Reviews/Comments can also be censored for certain bad words you can define in settings.