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.