The Chud review summed up a lot of my thoughts nicely. With this film, the creators try to shoe-horn Alice into the epic hero mold, which is totally wrong for her character. In this film, she's literally supposed to fulfill some prophecy about how a hero will save Wonderland. It's even worse because they completely give away the prophecy within the first ten minutes of Alice arriving in Wonderland. So the whole film becomes a lead-up to a final battle that, once it arrives, is completely mediocre in every way that a final battle can be mediocre.
The film had none of the whimsy of the books or of better Alice movies. The tone was wildly inconsistent, but it felt like they tried to make it far too serious. The Mad Tea Party didn't feel mad at all; they felt like a bunch of douchebags sitting around a table. This is a far cry from the old Disney cartoon, which made it pretty clear (to me anyway) that these were a bunch of drugged-out looneys on an epic coke binge.
In the old cartoon, Tweedle Dee and Tweedle Dum were creepy as hell. Seriously watch that scene and tell me it doesn't seem like they can't wait to gang rape Alice. In this film, they're a couple of dumb, lumbering lugs.
I had a lot more problems with the film, but I need to get to work. The Chud review is spot on.