There are a number of places where the movie felt like the plot turned away from where it was heading.
Rey and Kylo unite? Nah.
Leia dies? Nah.
Luke overcomes pain and returns as a master? Nah.
Finn does something impactful and important? Nah.
Poe is a hero? Nah.
Like, imagine if instead of Admiral Holdo it were all Leia. It sure as hell felt like it was supposed to be Leia. Imagine Leia never went into a coma, but she was clearly terrified by her near death and experience with the Force and upset over the loss of the command staff. (I mean, Admiral Ackbar is dead!) What if it were Leia's sacrifice at the end? I can't help but feel it should have been, and not because of Carrie Fisher's loss.
The problems inherent to the narrative, like Luke Skywalker being completely without hope when he literally is the New Hope are just... weird, and it goes on a bit too long. Yoda should've shown up sooner. I get that Jedi masters are old and crusty and don't want to teach the ways of the Force anymore. I get that the Jedi were wrong to ignore all emotion. Qui Gon was wrong to take Anakin away from his mother and leave her behind. Obi Wan was wrong to hide Vader's identity from Luke. Yoda was wrong in Empire Strikes Back to tell Luke to let his friends die. Luke is wrong to tell Rey to leave. Luke was right about Vader in Return of the Jedi. Rey was right to go to Kylo (surprisingly, somewhat). What does Obi-Wan tell Luke in A New Hope? "Trust your feelings. Let go." It seems that Jedi only gain enlightenment in death.
What the Jedi have done out of fear of the Dark Side is eliminate all emotions and therefore all virtue. The Jedi are not good. They're neutral. They're safe.
But safety doesn't make heroes. Safety doesn't protect your friends. Safety doesn't overcome tyranny.
In the end, again, Luke does overcome his despair. Again he follows his feelings and helps his friends, even at the cost of his own life.
Say what you will about the end of TLJ, but Luke still died a hero.