1. Palpatine has not yet learned that the "now watch as your friends lose a space battle" trick does not work.
A blast like that should have easily fried the circuits in all the rebel ships. The Resistance only won thanks to plot armor. What Palaptine really should have learned was the shield generator trick. He could have easily had the ships built within space and had them take off independently like normal capital ships did. he could have had multiple navigation towers or even linked to himself or his throne. This way Palpatine could coordinate his forces. This is the discount Force storm and Force wormhole move from Legends Dark Empire Palpatine. Honestly Dark Empire was so much better than this.
2. Palpatine has also not learned that when you shoot lightning at a jedi and they block it with a lightsaber, that's your cue to stop shooting lighting at them.
Palpatine faked losing to Windu. If anything that was a feedback loop and he redirected all the accumulated energy that was reflected back to him at Windu after Anakin chopped his hand off. Palpatine easily could have taken out Windu. This was more of a mockery of the Jedi showing his ultimate triumph over them now that Anakin: The Chosen One had turned to his side as his apprentice. Palpatine "lost" to Windu to get the final push needed to get Anakin as his apprentice. By doing this he showed Anakin that the Jedi were corrupt and just as bad as him. The Sequel Trilogy also shat on the Skywalker Legacy by destroying the legacy of Anakin Skywalker and destroyed all remaining Skywalkers and giving it all to a Palpatine (How ironic as good old Sheev would say).
Palpatine easily could have sucked all the life force out of Rey and Kylo leaving dead and Palapatine rejuvenated even more. Heck Palpatine was looked like how he was at the end of Revenge of the Sith. He could have sucked out some more energy to rebuild his face so he could get laid another time (since this is cannon now b/c Rey is his granddaughter). JJ Abrams nerfed Palaptine who could have easily wiped the floor with both Kylo Ren and Rey. Anakin could have easily wiped them out too. Heck during the fight between Vader at Luke on the Death Star, Vader was arguably holding back in the hope that his son turned so that they could destroy the Emperor and rule as father and son in a Galactic diad with Luke as the new Emperor.
5. Kylo gets to planet evil via an Imperial Era TIE fighter, a fighter that is most famous for lacking shields, lifesupport, and a hyperdrive, and he would have need 2/3rds of those to get to plot planet.
How would that even work since the Death Star exploded, and whatever wreck is left is now sitting in saltwater for 30 years?
8. Why is Kylo's welded together helmet constantly glowing at the weld points? That's not how welding works. Also, why not just get another helmet instead of fixing the broken one, why is he so attached to that one?
This resembles a Japanese art of
kintsugi form which restores broken ceramic as an art. The cracks are highlighted and things like gold are woven in to give it an art form.
While Luke pulling said x-wing out the water thing was nice, constantly having force ghosts doing stuff like that really makes one wonder why they never do that to help people. I beat having a bunch of ghost jedi show up and start throwing things at Sheev wouldn't been helpful during the final battle.
Luke if he could do that should have just went off and killed Palpatine who was basically living corpse on life support and held together by some sort of crane.
This sequel trilogy was a disaster. A large section of my theatre including myself cheered when Palaptine came on screen and said "the dark side of the Force is a pathway to many abilities some consider to be unnatural." Many were cheering "the Senate" when Palpatine was fully rejuvenated. I was actively rooting for the Emperor to return since according to Disney cannon the New Republic was horribly inept. And Disney also made Palpatine an idiot since they had him issue Operation Cinder to destroy loyal Imperial Worlds and assets only to retreat to the Unknown regions to build a new Empire. If Palpatine was alive and intended on coming back, he could have easily told the Empire to chill while they awaited his return. The Empire still after Endor was not dead, and could still have stamped out the resistance and Rebellion easily. It makes no sense for Palpatine to destroy his own Empire which he spent decades building (and the Sith spent 1,000 years laying the groundwork for) only to destroy it and come back later to rule the galaxy all over again.
His plan for Rey also made no sense. They should have had Palpatine appear to try and goad Rey into joining him much like how he did Anakin since Rey has no family and she is of his blood. He could have easily appeared as a grandfatherly figure and fed her lies about how the Empire was just and the New Republic Terrorists spread anarchy in the galaxy through their ineptitude. Rey would then turn to the Dark Side and Kylo Ren realizing that he was just a tool for Palpatine (like Count Dooku was) turns back to the light and tries to stop the Emperor from returning. They could have had Kylo be like Darth Caedus (Jacen Solo from legends) and had him only turn to the First Order after becoming disillusioned with the New Republic's ineptitude and corruption. He could have come to the conclusion that the Galaxy needed strong leadership to fight off some threat from the Unknown Regions (The Emperor's Return) and saw the First Order as a means to an End to unite the Galaxy around himself. Thus he would have somewhat noble goals but questionable means to attain them which makes him evil.