The funny thing is, I actually still need to see the first one (the grindhouse cut)!
I think part of the issue for me was simply that, for once, I wasn't watching a movie that I thought needed fixing. When I watch all the prequel edits, I'm wanting things to be as different as possible. But Empire and Jedi are pretty close to perfection for me, so it took some mental adjustment to get used to this wildly different interpretation.
But when I think back on it now, I'm always thinking of the masterstrokes: the integration of Revenge of the Sith into the opening of this film; the alternate arrival on Dagobah; the wildly different dream prophecy in the cave; the way that the scene actually played out when Luke got to Cloud City; the Trek/Wars Wampa; the hilarious revision of the Emperor/Vader discussion; the inclusion of most (if not all) of the Blu-ray scenes; the new duel; and, of course, that corker of an ending. I just keep nodding my head and saying, "Yeah, that was another really brilliant scene."
Like I said, I need to re-watch this soon.
Rather than seeing it as a replacement, I just need to see it as a Star Wars sequel from an alternate universe.