Originally Posted by DeafCaver
The first 3 HP films were fine with the way they were... close enough to the story lines as they were. But beyond that GOF, OOTP, and HBP they continually strayed from what was a reasonable adaptation of the books.
Rowling seemed to loosen her grip on making sure the films remain true to her novels. When that happens directors and writers take artistic liberties.
The real changes really started with the third film. Rowling was fine with it as long they stayed faithful to the core of it which they did manage to do so.
I've read all of the novels and I enjoyed them to a great extent, and I've enjoyed the film adaptations too as well. But that was because I had set different expectations for both mediums. What works in the novel may not work in the film, the same may be applied to the other way around.
To be honest with you, I think the 7th being a two-parters may end up being quite more faithful than you may believe. They are bringing nearly all of the characters back, including Ollivander, Dobby and more.