When you're watching the "holy trilogy" (just Star Wars, The Empire Strikes Back and Return of the Jedi), the original ending is best because it focuses just on our small gang of heroes and their part of the fight. It's like they're all gathered around the bonfires, they've popped open some cold ones, maybe roasting some s'mores, it's all cool.
But if you want to watch all six films together, ending with ROTJ, then I like the new ending. It starts out with our gang on Endor and the bonfires, but then it shows us the rest of the galaxy that we've come to know over the course of the six films.
It just reinforces the idea that I could deal with the changes if he'd just release high quality versions of the originals right alongside the new ones.