My only issues..
It's not horribly bad, but there were too many Issued I had with "The Witches of Oz." First off, an important rule was broken, Never introduce a new character in the third act. (Sometimes you can get away with it if said character is mentioned throughout the film. Such as Neil Diamond in "Saving Sivelrman," or King Richard in "Robin Hood Prince of Thieves." ) Two characters, the Gnome King and the Tin Man didn't appear until the climactic battle. The Tin Man should have had a cameo earlier in the film (in his "Our World" form.)
And the Gnome king, I didn't even know the guy was the Gnome king, until he says it. Like the Tin Man, he should have appeared earlier.
Also, I would loved to have seen some of the additional Oz characters in the climactic battle, like Jack Pumpkinhead and Tick-Tock. Jack appeared in the beginning, (during the oz sequence,) but that was it. I was even hoping that Nick would be revealed to be Jack Pumpkinhead.
I did, however appreciate that the film followed the books rather than the movie. (I.E. Silver Shoes instead of Ruby Slippers.)