1- Luke didn't really have to show up, I thought he wouldn't at all towards the end and they'd save it for the later half of Ep VIII. It's alright that he was there, no big deal either way.
2- Only two characters in this movie outright looked like CG, and they both look horrible. Lupita Nugyon's character looks like it's from Antz, absolutely didn't need to be CG. Should have just be a small person. Hopefully she's dead. Snookie looks ridiculous. Hopefully he's only a giant as a holographic projection and they decide to have someone with makeup in the next movies. Can't Andy Serkis just put on a costume? They basically already ruined what should be a character on par with the emperor, but he just looks like a bad CGed Voldermort. Both of these characters had no point in being CG at all, it just made them worst. Felt straight out of the prequels.
3- R2 turning on after everything happened felt a bit silly, I think they could have him turn on when BB8 first nudges him, because even with the map to Luke's location they would still have had to go and save Rey and Han would have still wanted to get an opportunity to save his son before they blow up the Death Star 3.0. Minor detail, but I don't get why they chose to do it this way, it just makes it feel a bit too forced like "oh we are running out of time let's wrap it up".
4- Finn and Co. stumbling on Captain Phasma on a planet-size spaceship was a bit silly. Don't see why they didn't just have her in the shield room with some other Storm Troopers, have them forced to surrender. I have a weird feeling she's written as a character that will never get killed, and will probably even join the resistance at some point.
My guess on how the story was going to unfold was Han finding out Ren is still alive after having lost him years earlier in battle and that he became a baddie (not Luke having trained him, rather the order having captured him because of his likely force sensitivity), Rey being Ren's sister, her and Han getting uncle Luke to help bring Ren back to the light side, and Luke killing Ren in front of Han instead of trying to save him and then leaving on his own, ending the movie on a darker tone. The next ones being about getting to the bottom of what's going on and Rey trying to catch up with Luke to reason with him. I thought they would have Luke try to suppress any remaining force users (and how it's futile because the force will always attempt to "awaken", "both the dark and the light"), believing only his family members remain as potential force users, but not being able to kill Leia/Rey because they're not evil yet, and this being in play in the next movies. Then he realizes it's pointless because the force will always be there and he passes on whatever to Rey.
So I surprised to actually see Han die and Luke not show up earlier
And yeah I hope Lando will return, would make sense any way.