Went to see this movie last night. It is very very good but you really need to have read the book (although not recently otherwise you’d just nitpick) first.
It is quite dark, although there are plenty of funny moments thrown in. If you’re a Harry Potter fan then you must go and see this….although you might want to wait till the kids stop going – bloody creatures!
I too felt like you needed to have read the book to fully grasp the movie. I just wrote a review for my blog at http://tuesdaymovienight.blogspot.com/