I saw it yesterday in 3D. It's a nice movie, I had fun with it, and ended up spending the rest of the eve with a group of White Queen impressionists. However, like others commented; it didn't blow my mind.
I think what it comes down to is that... I never really felt like I was in Wonderland, the setting just seemed to rely so much more on the characters rather than the background splendor, and the 'added characters' just didn't seem to fit properly...