Hi all. Again, don't post much, but thought I would go ahead and chime in.
I personally enjoyed Wicked. But I can see why some hated it, or really just didn't like it. Everyone has their reasons for things. I know that, so as far as I go (I will just summarize it)...
I thought technically the show was wonderful! I loved watching that aspect of the show. I thought the costumes were beautiful (and the costume changes were so well done!). I really enjoyed the music (yes, I am an Idina Menzel fan, have adored her for many, many years now...) and I truly LOVED Defying Gravity and No Good Deed, for me it embodied a lot of emotion. There are a few songs that I thought "what?" but they were okay, nothing that made me want to get up and leave. I thought the cast was great, however, the ensemble did not feel united at all. I thought that was the part that was truly lacking. An ensemble really creates the world of the play/musical, and they did not have that. (But their costumes were pretty! j/k)
As far as the novel and musical. I have read the book twice. Once before seeing the show, and then again after I saw it. I kept them separate. I did not want to be "jaded" when I saw the show, and of course they would not be able to grab the book and adapt it perfectly. Yes, there are major differences (first, Elphaba does not even study sorcery in school) but I managed to keep them as different enties in my mind. So I was not disappointed or anything like that. And I LOVE the novel, love it.
I can understand the whole backlash of the show. With all this constant talk, and constant 'whining', 'gabbing'... I can see where it gets annoying. I am happy that younger people are so moved by the show, because that means they will hopefully keep going to the theatre, and that means I will have a job!

So good for them! But of course, I don't see that as a reason to 'hate' the show.
That could come from some of the lyrics, that are just silly (although some of them, to me, were almost making fun of the Wizard of Oz 'talk', some of the silliness of it). Also, from a score that isn't the BEST ever (I enjoyed it and thought it was great, and have the cast recording and love it) but it isn't something that will be written as "one of the best scores written", in my mind. And there are some plot holes, not as big as other shows (if you want my input on that, look at my Brooklyn review) but there are still some there.
But all of those things, for me, didn't ruin the show for me, I still enjoyed it. And glady tell my friends and family to go see the show.
Okay, I will shut now.
Take care.