Berandor said:These things are called "ratings" because they "rate" films in comparison to each other. I can understand not rating movies, but if you do, you should try to make them comparable.
Yes, but there are many, many possible bases for comparison.
One may be in respect to an objective ideal of a perfect film. Another may be in respect to how well the film fulfills it's own promise. So long as you know the basis, you can use the ratings to compare. Different people will find different bases useful or interesting. That's the nature of the artful beast.