But, you’ll admit that some films are simply poorly made and poorly written, right? There may not be some inherent metric for judging a film’s quality, but the fact that we keep trying to create metrics to assess films (Rotten Tomatoes, Metacritic, IMDB, etc.) shows that we are aware of inherent quality differences between the movies we watch. It’s like how we know the Mona Lisa is a better work of art than a child’s drawing. The child’s parents may have a greater subjective attachment to their kid’s art, but it’s almost universally understood that the Mona Lisa is better conceived and better executed as a work of art, even thought we have no way of quantifying that.