I don't agree with you. FLUFF is a word that people use to describe musicals too loosely. Everyone expected HAIRSPRAY to be fluff - that's why it was such a revelation when it opened - because it was the complete opposite. It has amazing moral values, wonderful messages, and complex form that are all rare these days. They did it all tastefully while having fun.
Wicked is fluff, you're right.
The Producers, is nasty fluff. The worst fluff of all? Never Gonna Dance. But to say that about Hairspray, that just goes to show that you have severely missed the boat when you went to see it. I doubt anyone in that show was on speed - it's brilliantly written, and the only tony award winning musical in the past few years that actually deserved to win the tony. Millie was an abortion, and Avenue Q barely deserved it. Hairspray is nearly perfect in every way, and it's the farthest thing from fluff - it's smart, genuine, real theatre.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson