My opinion is that when I first got the Cast recording for Wicked, I thouht that it was one of the greatest things to come since Phantom, the show that got me into Broadway. Then I finally saw the show, and while I enjoyed it, it wasn't one of my favorites. You see, before I invested myself into Wicked, I was already into Sondheim, Webber, etc. and after I saw Wicked, my love for the show increased, as well as my love for other composers. You see, the fans that are teenagers are just getting into theatre, an activity that isn't usually very high-profile amongst teenagers. However, they see this show and are like, "Woah, that was the best thing in a while!" and encourage all of their friends to see it, and once their friensds see it, they agree that it's the best show, and by help of the actors into, whom they are becoming fans of, will hopefully expose them to new shows. (Idina in RENT and SWIWS, Norbert in DRS and L5Y, etc.) Therefore, they will start to become more exposed to a dying artform that is being revived by this show, and a new generation that is into it.
So while not everybody will like Wicked, others will, and will hopefully revive a dying and spectacular artform.
MARGARET: "Clara, stop that. That's illegal." - The Light in the Piazza
"I'm not in Bambi and I'm not blonde!" - Idina Menzel