Went to see this last night with the girlfriend.
3d is slightly underwhelming after seeing Avatar recently. Script was a bit weak and CG effects not anywhere near the same league.
The acting is decent, but overall it seems a little bit watered down. Possibly the Disney influence. Burton doesn't build much of an affinity with the characters, although the Mad Hatter is carried off well by Depp and H Bonham-Carter does a cracking job as the Red Queen. Probably taking some influences from Queenie in Blackadder.
Go see it if interested in Disney's modern take on the Alice tale or 3d experience. Decent family experience. Nothing groundbreaking though imho.