Even if a course is not assigned to users, they can view the reviews for it in the Catalog.
- Go to the Catalog section in the user portal. In the thumbnail, you will see an average mark of the course.
- Open the course you are interested in and go to the Reviews tab. Here you will be able to view all the reviews and marks, as well as an average mark for the course that is calculated as an arithmetical means of all the marks.