Many people enjoy discussing and judging the morals of characters in films, but that’s not the main point. Very few characters are entirely good or entirely evil, which tends to result in dull and poorly made movies. Regardless of whether viewers resonate with the story, they should show compassion for the characters. It’s important to interpret their motives and circumstances to understand what led them to make certain decisions and to reflect on ourselves.
I feel like that is more of a reflection on how audiences can critique a film beyond which parts were good and bad.
Critique of cinematography requires an understanding of visual arts. Critique of sound design and scoring requires an education in music. In contrast, methods to critique characters and plot are taught in every high school literature class.