I suppose what I disliked was how the pacing of the book (which was slow and tame) was replaced with cheap thrills meant to heighten the suspense (like the wolf chase or making the Witch seem so evil right away).
Narnia's story was supposed to be about the kids if you ask me. It was supposed to be about their experience of some amazing events. That was almost totally lost in all of the cinematically forced emotions and the overabundance of combat sequences. Aslan seemed so unimpressive squashed between all of that.