Luke is out of character in TLJ.
I liked his character but this is the most understandable complaint I have heard of against the Last Jedi. I completely see where people are coming from cause it was a bold and risky decision.
I’m still bemused by the way people think that he would have stayed in stasis for 30 years and not changed as a person. It’s a pretty long time in which a lot of events could have happened. On top of this they had to write a story in which he doesn’t just come back immediately (making him look like an idiot for hiding in the first place) and an arc that doesn’t end in a videogame massacre where a dozen AT-ATs are smashed (making it look like one man could have won the war - or the wars that came before this - single-handedly at any time). Outside the third flashback being too similar to Kylo’s version it was all pretty well thought out.
I get what your saying about how it would be stupid for one man to be able to single handedly win the war but there are two things I really wish they did one of two things with Luke at the end of the movie: Either give us an epic lightsaber duel with Luke against Kylo or have him live at the end and do something else with him in 9. I honestly just wanted a moment like what we got with Vader in Rogue One. I’m not saying I wanted Luke massacring people but I wanted something that really showed his fighting abilities. It’s very much a fanboy like desire to have but I can’t deny that I still really wanted that.