The Keep = Top book crap film.
All of the Harry Potter books. I grew up reading them so I really like him, but I hated the films, especially the latest one.
Northern Lights
Angels & Demons
Da Vinci Code
Godfather and The Shawshank Redemption.
But really Hitchhiker's Guide To The Galaxy.
So long as you get a good film out of it though, i.e. Bourne, who cares?
People always seem to have problems with how closely a film adaptation sticks to the book, apparently even Jurassic Park veers quite a bit away from the book.
I don't really see the problem most of the time. Most books, if adapted to the letter, would be so utterly dull on screen. A Scanner Darkly kept pretty close to the book it was based on, but then that book was quite short.
So long as you get a good film out of it though, i.e. Bourne, who cares?
All of the Harry Potter books. I grew up reading them so I really like him, but I hated the films, especially the latest one.
For Lord of the Rings I agree that Sarumans death was stupid, Faramirs entire character was changed to a greedy idiot instead of a selfless wise person. I can forgive the films removing the whole Tom Bombadil section as I have no idea how they would have portrayed him, but I CANNOT forgive them removing the scouring of the shire! Thats half the point of the story. The point is that while you are off fighting a war for all the things you love these things are changing to become unrecognisable while you're away.
The problem is books are overrated in the first place. A lot of novels I've read are far too long with too much padding (like The Godfather) so cutting out massive sections for a film is a point of necessity.