First, the good...I really, really like Kylo Ren...I thought the development of his character and his relationship with Rey sets up for an incredible showdown. Her character advancement was very interesting as well. The battle scene where they kill Snoke was incredible. Second, Luke's scenes were most spectacular...I loved the twists they put in with his character. However, the ending they gave him was incredibly disappointing, although it did follow the general disappearing Jedi finish that many of his predecessors had. Also, I thought Leia's role was pretty great, although I could have dealt without them almost being out of fuel for 3/4's of the movie. Finally, the final scene with Luke, Kylo and the escape was really well done overall.
The bad? Well, Fin going right at the canon and surviving with the Poe save...then Poe kissing him and falling aside like an 80's teen drama...then him being there with her exactly like Rey was with him in the Force Awakens. Tacky. Then the little "Happy Feet" looking friends that Chewy makes...I hope the kids like that shit, because it looked way out of place in a Star Wars film. Finally, the female character on board with Leia that takes out the destroyer towards the end...she was basically unbearable, I could barely watch her. She went out the right way, but she added nothing else to the movie.
But like I said initially, I thought the movie was awesome overall and I probably will see it one more time in theaters.