How many stars on average do they use to rate movies?

There's no single, universally agreed-upon average star rating for movies. This is because different rating systems use different scales, and even within a system, ratings vary widely depending on the movie and the audience.

Here's a breakdown of some common rating systems:

* IMDb: Uses a 10-star rating system. The average rating for movies on IMDb is around 6.5 stars, but this can fluctuate significantly depending on the movie's popularity and critical reception.

* Rotten Tomatoes: Uses a "Tomatometer" score based on the percentage of positive reviews from critics. The average Tomatometer score is around 60%, which translates to a mixed response from critics.

* Metacritic: Assigns a score based on reviews from critics, but their system is more complex and uses a weighted average. The average Metacritic score for movies is around 55.

* Other platforms: Websites like Netflix, Letterboxd, and other platforms have their own rating systems, often with 5-star scales. The average rating on these platforms will vary.

It's important to note:

* The average rating for movies can be misleading. A movie with a 7-star average might still be considered bad by some viewers, while a movie with a 4-star average could be considered great by others.

* Individual tastes are subjective!

Ultimately, the best way to determine if a movie is worth watching is to read reviews, consider the genres you enjoy, and see what other people have said about it.