I don’t like the concept of Palpatine coming back from the dead. In fact, I prefer to retcon Dark Empire by saying that the Emperor from the comics is just a wild, crazy clone, and not the real Emperor.
I don’t like some of the weirdest books from the 90s, like the Callista Trilogy and The Crystal Star.
I don’t like the fact that Vitiate comes back so many times. He should have been killed for good by the Hero of Tython, and that’s it.
They should have avoided creating so many stories about the Rebels stealing the Death Star plans. Rogue One did it way better in my opinion: we only have one story and there is no confusion about how the Rebellion stole those plans.
Everything post-NJO is just stupid.