It's one of the biggest disappointment I have had for a movie. It's easily the worst Star Wars movie. The Force Awakens was at least half decent while copying the old trilogy. Obviously there will be some spoilers in my thread.
They completely ruined Luke's character, he never become a master jedi, but became a depressed hobo, weak and self destructing. He had no clue about anything, was whining for the most part of the movie and then died in a ridiculous and hopeless death.
The rest of the movie is also tragic: it's an endless combination of heroes running aways scared from the danger, some will attempt to make a diversion, one will stay behind to die in a useless way, rince and repeat.
There are just no logic at all in the plot. Why rebel captains are staying in their ships to die while they are doing nothing than waiting? Why the rebel admiral waited to die when she finally decided to kamikaze herself? Why the guy who betrayed them even started the operation when he had no clue of who they were and what they were doing?
Kylo Ren is still awful. Even after killing Snoke, he can't get any respect. And the killing of Snoke, he was so powerful he could toy with Kylo Ren but yet he is dying and we won't get any explanation of him...
So in resume, Luke's character ruined, the plot make absolutely no sense and has tragic flaws, Kylo Ren still an awful and weak character, Snoke disappearing brutally. I don't think I will watch the next with such a tragedy.