Luke throwing down his lightsaber might be the best part of ROTJ. He's finally learned the lesson from the cave. "I am a Jedi, like my father before me." Chills.

I do have a few problems with his arc. First of all, he enters the movie as a fully fledged Jedi, despite not completing his training. Secondly, I wish he had stronger feelings about not being told the truth about his father; as is, Obi-wan shows up and he's just like "okay." Thirdly, there's never really a moment where we feel like he could actually turn to the dark side, and, lastly, his confidence in Vader's goodness is not at all justified.

Not sure about his goal but the fact that Yoda and Ben seem to be so intent on Luke facing Vader is never really explained, and I don't know if there is any good reason behind that other than Vader is "evil" and must be defeated. I feel like there was a lot of room for depth there that was sort of glossed over.