Netflix used to do that. You used to be able to rate programs between 1-5 stars and see the average rating. I believe it also recommended other programs to watch based on what you rated highly.

They did away with that system and replaced it with their custom recommendation engine. I believe, without any evidence, they did this to make bad shows look better. They once hosted a documentary about sex workers (can't recall the name, sorry) that had an average rating of around 2 out of 5 stars, and after the recommendation system change, it turned into a "75% match" on my account.