This is a pretty dark movie actually. The parts on the Sith world were quite unsettling. I love how Palpatine is as all-powerful as he is. He and Yoda are supposed to be the most powerful Force users that have ever existed so it's good that it shows.
Palpatine being able to just Force Lightning the entire Resistance/Republic fleet at once is awesome. Like Vader said "The ability to destroy a planet is insignificant next to the power of The Force." Palpatine shows it. Minor nitpicking though, I realise Rey was supposed to have the backing of all of the fallen Jedi in the conclusion, but this was a good chance to get those Jedi visibly behind Rey and tie all the trilogies together. You hear their voices, but it would have been awesome if at first you see Luke, then old Obi Wan, then Yoda, then Mace Windu, then Qui-Gon Jinn and the other Jedi from the council, I think you even hear the voice of Ashoka Tano in there so show her as well, and then finally even Hayden Christensen's Anakin. Save Leia for the final scene on Tatooine like in the film now, that's powerful.
I don't like the fact that there's again some kind of planet-killing device. The Death Star was always supposed to be some ultimate terror, the pinnacle of Imperial might and according to Episode 3 and Rogue One some kind of super complicated tech, but then Episode 7 came with it's own version of it and now..
They can fit a weapon that's as powerful on a single Star Destroyer. I'd say the ability to spawn an endless fleet of ships would've been enough already.
Also, I think the backlash about Rose's character when The Last Jedi came out probably diminished her role for this movie. She kind of felt like an Episode 2 Jar Jar. Next to that, I'm fine with Rey's origins and the resolution of Kylo Ren's character. I'm happy Chewie finally got a medal (Han's I presume), but Finn I am also impressed by how they used Leia after Carrie Fisher had already died. The use of earlier shot scenes is amazing. Not sure about Rey's healing ability though and it's too bad we never got an answer about how Maz got Anakin/Luke's blue Lightsaber in Episode 7 after it fell into the abyss on Bespin in Empire Strikes Back. But, I'm very happy my favourite Lightsaber colour, yellow, is now also finally movie-canon.
Finally I was totally surprised by the appearance of Han Solo there, even if he was just a figment of Kylo's imagination, I did not expect Harrison Ford to be there at all. Cool to see Wedge again for a second.