I'm past the Han thing. It's over, the character is gone. He was cool enough before it and it was nice seeing him one last time. Atleast Ford played him better than he did in ROTJ. Sure, it might not have been a happy send off and he went out like a gullible chump, but this isn't exactly a happy story.
My biggest gripe is Luke. Luke was proactive. It was his idea to go and rescue Leia in the first one. He abandoned his training to save them from Cloud City. It was his plan to rescue Han from Jabba the Hutt. His friends always came first, in fact, that's what the Emperor tried to use against him. He also believed in his father when Obi-Wan and Yoda did not, and that love led to Vader's redemption. It seems out of character for Luke to leave Han, Leia, Chewbacca and everyone else behind in such bad times. Ok, so he somehow failed with Kylo Ren I guess? So what, thats it? Let your students die in vain and let the bad guys build up their strength putting your friends and family in danger? You were commander Skywalker man! It's literally the situation Yoda and Obi-Wan found themselves in at the end of ROTS. We have to see that same mistake played out again?
Besides, if he wanted to be a hermit and secluded, why would he leave traces like a map and the R2 nonsense when he wants to be left alone? What's the point of bread crumbs if he doesn't want to be bothered?