I think the bigger but not only problem with Luke is that we don’t see him get this way. Like many things in the trilogy it feels like essential pieces of the narrative are pushed to backstory or are never acknowledged to get us up to speed. It feels like an important story was skipped over in favour of something familiar and nostalgic with The Force Awakens.
On its own merits I think The Last Jedi in general is a very flawed but pretty intriguing and layered film. It’s far from a masterpiece or the dumpster fire some claim it to be. It’s somewhere in the middle but finding middle ground discussion around it is like finding a needle in a haystack.
As its own thing I give it about a 7.5 or 8 out of 10.
If I had to rate it as a continuation of George Lucas Star Wars I’d give it about a 4 out of 10. However even then I admittedly find that to be pushing it.