>>1146689042/3 of the franchise sucks massive dog cock because they were directed by that old perv George. ESB and RotJ are only good because they had directors that weren't George. This is because George is an actual sperg who doesn't know how people talk so all of his dialogue is absolute horseshit. He's also a one and done type of director where he'll just do only a few takes of a scene and then say it's good enough. Mark Hamill had to tell him that his lines were stupid and beg him to change it. The only thing George is good at is world building and making epic plots, he is very much so skilled on the macro level of stories. But once it comes down to the micro level of dialogue he just sucks. That's why if you're to read the prequel era it's one of the best stories but when you go watch the movies their absolute cringe.
Sequel era kinda had the opposite problem, I think the dialogue was fine and small scenes were okay in the Disney movies, but the story was so unfocused, unhinged, and stupid that it made the movies fundamentally bad as opposed to just being cringey and sloppy like George's stuff.
The EU has the benefit of having some decent writers flesh out the world that George built and having someone who can actually write dialogue make compelling stories. For example: KOTOR and SWTOR