It seems like I dislike this movie for the same reason that many people like it: the underlying message of hopelessness.
Luke is actually a depressed hermit instead of a noble hero. Sacrificing yourself for the greater good is actually not a good thing. It doesn’t matter if the Resistance loses and everyone dies, because some Harry Potter cosplayers will rise to defeat whatever fascist government is in charge at that point. For a franchise all about heroism and the light beating the dark, TLJ sure loves to portray heroism as the wrong choice every time. I used to love this movie because of the subversions, but now that I think about it I realize that the subversions actively harm the thematic structure of the saga.