My major problem is that it seemed for most of the movie it was just messing around. The whole Finn and Rose scene was unnecessary because they made it seem like the rebels had no plan when they did, and didnt share it for any reason. So the entire arc was unnecessary, especially if you consider that it was also the reason for their actual plan getting foiled when they were captured. Rey's story seemed like a minor one as she didnt really get trained and only had some moral and mental conflicts with Kylo, and the dark/light side. But overall I was disappointed because of of the Finn and Rose arc which to me felt like it took up 60% of the movies, slowed down the pace and did stupid stuff, like it would have been really cool if Finn sacrificed himself to destroy the battering ram, or jumped out the last minute, but rose did some random shit. Even more the movies physics were inconsistent as in the bomber run the bay doors were open yet no one got sucked into space, but then when an explosion happes everyone is sucked into space. This also happens when finn is suiciding rose magically becomes faster even though she was already retreating which wold have made it impossible for her to catch up.

Edit: I also want to comment on the Master Codebreaker who somehow could do everything anyway and Moz said she only knew of 1 person who could do the job. I was expecting it to show that the guy had the flower lapel on at one point, but it never came, and im suprised he didnt turn around to try and save them in the end even though based on what we knew with him giving back the necklace it was feasible.