In addition to the core Totara report sources (https://help.totaralearning.com/display/TL110/Report+Builder) Kineo have added a report source to allow you to report on course ratings across your site. Please see the article on the Course Rating Block for more information on adding that feature.
Course Rating Report
|Source:||Course Rating Block|
A list of all ratings and reviews across all courses
Ratings: Review date, Review, Rating.
User: User First Name, User Last Name,
Course: Course Name (linked to course page)