Soleron on 11 May 2012
The films are faithful to the books throughout, but the first film was very rigid like they didn't want anything to go wrong so it ended up being a bad standalone film and more just the book on screen. They do improve a lot after #1.
Later films got better at being films and the child acting/effects/atmosphere improved. The books also took a darker/more mature direction which carries over to the films especially starting with #3.
(The one who plays Hermione never gets better at acting though)
