The idea that having multiple villains ruins a superhero film and that it's always or nearly-always better to just have one villain.
Sure, it's possible for a movie with multiple villains to feel overly-crowded and with some less developed but it's also very possible for a film with just one to feel like an overly-simple story and missed opportunity. Multiple villains can and have worked and the real problem when they don't is usually the tone of the film in general.
It just seems real strange when fans hope for having just one villain in each film when it's likely that a series will only last three or four films so we would end up having really few of the characters and story potential adapted.
Sure, it's possible for a movie with multiple villains to feel overly-crowded and with some less developed but it's also very possible for a film with just one to feel like an overly-simple story and missed opportunity. Multiple villains can and have worked and the real problem when they don't is usually the tone of the film in general.
It just seems real strange when fans hope for having just one villain in each film when it's likely that a series will only last three or four films so we would end up having really few of the characters and story potential adapted.