Thanks for using Sitefinity.
Right now we have not implemented a rating system in Sitefinity (I'm guessing you saw the tables for it). It is tentatively in the works but not accessible via the UI or API and we don't have a hard release date for it yet. However, you can use a third party control or develop your own using the module builder for the time being if it is a requirement.
Sorry for the confusion.
All the best,
the Telerik team
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