Star Wars 9 rise of sky walker [Spoilers]

They really screwed up not working out the story arc ahead of time. And as others have said, the new episodes were disjointed both from each other and the rest of the series.

Aside from that perhaps the biggest sin of the sequel trilogy was getting the original trilogy stars back and then failing to write a single scene with them together. What a wasted opportunity, one they can never get back.