wow. hot topic.
Here's what I think:
what makes the Undestroyed RotJ ending so uplifting is that it shows the Skywalker family re-united and reconciled, and at the same time, appeals to religious beliefs about redemption and forgiveness.
It's not the various sites of people celebrating in the ending that puts a smile on my face,
It's when Leia runs up and hugs the Brother who she just learned she had returning safely to her, and Luke sees his father as the man he would have been at peace and reconciled with Obi-Wan and Yoda, smiling proudly and happily at him.
I don't think the rebels problems are over after RotJ, but they're definately one GIANT step closer to becoming so. but in the meantime, the MAIN plot point about the trilogy, The Skywalker family, has it's story wrapped up perfectly, and I get a genuine fealing of closure, in that there's nothing more that can be effectively done with those characters.
(and yes, I've felt that way about the Trilogy before the Photoshop program used to create the "prequels" was even blueprinted at adobe)