Who does what
The sign of a good movie or story is one that gets people talking about what the characters did and exploring the reasons that motivated them. A great movie/story is when the characters are complex enough that they aren't simply cut-and-dried. For example, they're a bad guy simply because they're a bad guy.
A downside of this is when the number or levels of motivations for two or more characters are pretty close together. The idea of "there has to be one person behind it all" becomes the focus and the discussions turn into arguments and edit wars as the hunt to find out who is more of an antagonist goes on, with expeditions into ideas like who is on screen the longest or who looks like they're doing the most work.
It's impossible to get ever…