The pacing is super fast, jumping and cutting all over the place. The emperor looked great, but his whole deal is to make things up as he goes.
The emperor is alive, somehow, and now he absorbs souls? OK, but now his soul will be absorbed by ray because dark science or whatever??? OK now the emp uses his thunder hand thing against the entire rebels and they almost die. But ray can reflect all that power just like that...
Star wars spoilers
So the final battle is just emperor and ray standing in one spot as giving each other the Jedi look. Then ray wins, she's the protagonist I get it but the fight had no dynamics or anything cool going on, just two characters standing near each other.
So ray wins and the emperor's army crumbles hooray! Oh and ray dies but the power of kylo rens kiss revives her. OK that was strange.