I'm one of the few that thinks that the PT is better than the ST. Sure, it has it's faults, but it told a relatively cohesive story from start to finish. I think the most important thing to remember is "It's not my Star Wars". Still, here's my two cents:
Lucasfilm is showing many of the mistakes that
Lucasarts made prior to them folding. Too much indecision and second guessing made it impossible for them to move forward. There also seems to be a lot of disputes and Solo suffered for losing it's Director half way through.
The Skywalker story had been told and had a defined ending in RotJ. I don't see why Disney needed to pull at that thread. It also made for a very small universe. Rogue One has shown that there is room for all types of Star Wars stories. Personally, i'd like to see more of the seedy underbelly of the SW galaxy.
I didn't like the way the OT characters were killed off. But that's a personal thing.
The sequels suffered for not having a planned story arc and instead, Lucasfilm decided to allow the Directors to progress the story in a way they saw fit. TRoS didn't follow story leads given by TLJ and we were left with main characters just sidelined. Plot threads were just dropped. Characters i enjoyed throughout were just left without a role.
Disney appears to be trying to "outdo" Lucas's Original Trilogy. Liked the Cantina scene? Here's a bigger one! Redesigns of some of the old star ships didn't make a lot of sense. (Those half jet engine things on the X-Wing and the escape pod on the Millennium Falcon.) Bigger Star Destroyers with their own planet killing lasers. It gets boring quickly.
Many elements of the original trilogy were retconned (still not sure what that actually means). This was especially noticeable with Solo and elements of his back story. I still don't understand why.
The failure of the ST has made Disney look back at old characters, such as Boba Fett. Again, i feel this only serves to make the Star Wars Galaxy smaller and feels like a quick way to bring back the fans of the OT. It stinks of fan service. Besides, revealing too much about certain characters only serves to lessen the legend they carry. (I have to confess that I've yet to see The Book of Boba Fett.)
Disney bought Star Wars because they wanted to attract boys of a certain age to their brand. Politics took a hold but the whole "The Force is Female" stance didn't seem to go anywhere. I'm all for strong female leads but that seems kinda off message for me.
I'm also going to suggest that there were no, good villains. None!
Still, there have been a few things that Disney has done well. Donald Glover's Lando Calrissian, The Mandalorian, Rogue One and Jedi: Fallen Order are all excellent Star Wars.