@Tératogène And then I discover where your avatar come from!
She sure do have a great voice! (I'm curently watching some you tube's videos starring her, it's never too late to get some cultural refrences, right?).
I have very little knowledge about musicals, I thought it was the wicked witch of the west from "Oz the great and powerfull" by Sam Raimi. Since I have never seen that movie I didn't find that statement iconsistent.(I found the pic quality way too good for the movie with Judy Garland and the wicked witch did'nt even looked like that so... Uncultivated you said? You got it girl! ). You didn't see anything.
I can understand your point, the nostalgia is a great part of the perception of somehing (we're talking about movies and musicals but it can also be applied to places) and even a great performance can hardly beat that. We get attached to the feeling that follow the discovery, the memories, and we can't said that a simple new performance as good as it can be could erase that. That's normal after all.
But for me there's a difference between saying "Oh my! I prefere so much this version, it's the best of all time!" and saying "This version is crap and shit it should have never seen the light of day" and all the shitstrom that can follow. And for what we talked about previously (the potential reactions of old school Star Wars fans) most of the time or mostly the ones we'll hear the most will be of the second reaction category range with over-aggressive and angry opinions. If I understand the love you can express for some piece of art I can't understand the opposite: the blind hatred for something like that, unless it's spread sick ideas and philosphy but it's rarely the case (I mean people rarely hate a film or a musical for that kind of reason), so...
Anyway! Of course i can understand the lack of objectivity , and who can seriously say that he is objective about art? But hate? Being passionate is probably the most beautiful thing that can happened to someone, but if it's putting people through hate... Well maybe it's time to move ahead, no? That kind of reaction always left me both puzzeled and tired.