I've probably mentioned this before at some point but I just can't help repeating it again.
I was fine with the LWW film up until their meeting with Father Christmas. Some may have objected to the softening down of Lewis's apparently hard line stance against girls fighting but this did not bother me. No, what angered me was the explanation for why Father Christmas had finally arrived. In the book he says 'Aslan is on the move. The witch's magic is weakening.' But in the film this becomes 'The hope your majesties has brought is weakening the witch's power.'
In one breaking the witch's power, symbolically breaking the power of sin is the result of Divine intervention, in the other the result of human action. This is in fact the Narnian equivalent of Pelagianism.
It's not surprising the film went downhill from there.