Media Settings : The Features Module : Allow Ratings on All Media
  
Allow Ratings on All Media
Ratings provide a means for your users to provide additional feedback on content by using a star-based ranking system. Users can use this feedback if they do not want to leave a comment (or in addition to comments). This feature is enabled by default. Only Account Admins and Media Admins are able to enable and disable ratings.
 
*To enable ratings:
1. Navigate to Admin > Media Settings > Features.
2. Select Allow ratings on all media checkbox.
 
Keep in mind:
If disabled, there will be no ratings feature on any content (either input or display).
The ability to Bulk Edit the ratings feature will no longer be available.
If ratings are disabled after they have already been submitted, ratings data will not be deleted. If enabled again in the future, existing ratings will once again become visible for the content.
If ratings are enabled globally, the Enable Ratings check box appears on the Video Settings page which will allow ratings to be enabled or disabled for specific videos.
 
*See Also:
Video Player Options
Enable or Disable Ratings for an Individual Video