It was quite poor for a Tim Burton film, I felt. I didn't buy Mia Wasikowska's performance as Alice, as everything she said seemed unnatural and fake (A great example is when she's first walked into Wonderland and she says "Curioser and curioser"). I also wasn't blown away by Anne Hathaway's performance, as something just.. grated with me. Matt Lucas was, in my opinion, one of the better performers in the film, with Johnny Depp also being quite good.
Another problem I had with it were the effects - They seemed overdone for the 'human' characters and at times they looked incredibly poor. I found it was quite common with Crispin Glover's character for the animation to look quite, well, fake. In regards to the anthropomorphic and/or animal characters (Cheshire Cat, the rabbits etc), the animations were fine, though.