Harry Potter 1 & 2 were also good adpatations to the books. After The Prisoner of Azkaban, it went south fast.
The books got bigger with each one, more and more had to be left out or changed. But even then, they followed the books for the most part.
Deathly Hallows was really good. They kept nearly everything in thanks to splitting the book into two movies.
EDIT: Although they milked the hell out of Snape's Memories in an attempt to make him a redeemable character. Blegh, dude's disgusting. Alan Rickman did a hell of a job portraying him though.