The haters have to at least admit that the scene with Yoda and Luke was very good.
And I love Yoda's aphorism:
"Pass on what you have learned. Strength, mastery, hmm… but weakness, folly, failure also. Yes: failure, most of all. The greatest teacher, failure is. Luke, we are what they grow beyond. That is the true burden of all masters."
It's kind of like that scene in Rocky V (another franchise movie that is quite hated by the fans of the series) where Mickey appears in a flashback and imparts words of wisdom and comfort from beyond the grave to a downtrodden Rocky.