When Netflix used a star rating system, the star rating it showed you was Netflix's guesstimate of your expected rating. It's guessing how it thinks you'll rate

When Netflix used a star rating system, the star rating it showed you was Netflix's guesstimate of your expected rating. It's guessing how it thinks you'll rate the movie, based on what you've watched and rated, and what other similar people have done. It's not always going to be right. In 2017 they switched to a thumbs-up / thumbs-down system, and now they show a percentage which I believe is their estimate of the chance you'll give it a thumbs-up.