I'm sure many others must have noticed. It's almost like the Defence Against the Dark Arts post - each book has a different teacher. I'm not exactly suggesting that Cuaron is a werewolf. Just that I like this film the best so far!
Seriously. I think it is a great idea - we'll be able to expect something new, something different with each movie, which will really make them more exciting to watch. I mean, if most of the people who're watching the movie have already read the books, it's better to have little changes in styles and approaches each time round, so that it doesn't become boring... hope you get what I mean :/