I saw it in previews in SF, and I agree that at least at that point, the Wizard part needed some work. His solo was somewhat tedious, and then he was a bit underplayed in general.
I enjoyed Wicked, but I didn't think it was extraordinary. The cast was excellent, the sets are fun, but it's a bit... I don't know if cutesy is the right word.
'"Contrairiwise," continued Tweedledee, "if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic."'
~Lewis Carroll