On FrontPage you services can be rated by your subscribers. This will help the future prospective subscribers to seriously consider your services. These ratings are displayed against your training services in the services discovery page.
A subscriber can rate your service every week till the time the subscription is active. Average of all these ratings by a subscriber is considered towards final rating. This is to make sure that a subscriber view is balanced and not biased by one portion of the service.
A service creator can keep a track of his ratings from creator console.