Why Aslan Is the Worst Thing About Prince Caspian – Lev Grossman hits the nail on the head:
“If I had a problem with the movie, it’s the same problem I have with the book, which is what the hell is Aslan doing playing peekaboo with Lucy for most of the story while all the Narnians are dying for him? I felt furious with him when he finally showed up, but all the characters just worshipped him as usual. To their credit they ask him about 20 times why he wouldn’t help them, but he always responds with some faux-profound stuff, and they nod like it makes sense. But it never made sense to me.”