I just got back from it, and enjoyed it quite a bit. Not as good as the Lord of the Rings movies, but much more faithful, and much better, than you’d stereotypically expect a hollywood adaptation to be.
My least favorite thing: Well, some of the animation looked a bit too much like animation, but what bothered me the most (and this is pretty minor on the grand scale of it) was the kids’ conversation with Professor Kirk. I remember it from the book as him basically saying “keep an open mind, think about it logically, and evaluate the likelihood of everything. In particular, how likely is it that Lucy would have made this whole thing up, and the burst out of the wardrobe instantly?”, whereas in the movie he practically seemed to be begging the kids instantly to accept her story immediately, with no serious debate at all. Whether this was a sop to Christians, I’m not sure, but it was the only thing that kind of irked my agnostic self.
My favorite thing: I really liked the grown up kings and queens at the end, and the performances of Jadis, Aslan (both voice and facial animations), Lucy and Tumnus. Oh, and the charge of the Rhino.
A few other things I wish had made it:
-Playful Aslan after he comes back
-The Other Lion ("he said ‘us lions’ ")
-More with dryads and naiads and stuff (or were they mainly in Prince Caspian?)