Two story threads that did not follow.
The first is the premise of the Resistance, New Order, and Republic. From how they are portrayed, it feels like the Resistance is little more than the Rebel Alliance continued, as if they never really won or came into power in the OT. 30 years later and their "fleet" is still a small pack of X-Wings, they have one main base, and still seem like a ragtag group that had their back to the wall. It felt like the victory at the end of the Jedi didn't count for anything; I really didn't follow what was supposed to happen since. I'd have preferred a setup where the story was flipped, with the old Alliance members being in a position of strength but finding themselves under increasing assault by the New Order.
In the narrative itself, I didn't understand why they went to Kaz's base, what the goal was. I feel like missed a line of dialogue or something, but when they were there the story seemed to stall out. They basically needed some downtime for some character beats and to wait for the factions to catch up to them, but I didn't catch what they were intending to do.
I think things should have been reworked to have Leia give Rey the saber. Would have implied some pretty big changes on her getting captured, but I would see it this way:
1- Stop at the cantina to refill. Maz doesn't exist.
2- The Order and the Resistance arrive and the big fight happens.
3- Leia would have had the light saber and would have used it during the fight after losing her blaster trying to save Han (I think it would have been pretty cool, making Leia bad ass, which she was in the OT, without making her on par with Luke, no force power), Han and Leia gets ultimately saved by Rey, can't be TOO bad ass.
4- The good guys win, the order pulls out.
5- Leia meets Rey and Rey is curious about the saber, Luke, etc., and Leia feels there's something special about Rey. Rey touches the saber and has her vision.
6- During the night, Rey is called out, almost trance like, as if Luke is calling to her. She walks out of the location they are staying at, going into the forest. We are led to think she is going to meet Luke, maybe speak to him through the force. We see a robed figure. It's Ren.
7- Ren force-freezes her, captures her.
8- Leia gives the saber to Finn and Han, saying she feels Rey is meant to have it.
That to me would have worked much better than what we got.