Twillight: wait, no, both the movie and book belong in the landfill next to the ET atari game.
Let's see, IT as a book was pretty twisted. I'm not suggesting that EVERYTHING from the book should be in the movie, but being a made for TV special IT had alot of the options taken away from it before it could even be made.
Starship troopers, oh where to begin? Most people know about the first movie, which was pure awesome. Fewer people know about the second movie, which is a good thing because it removed all that was good and cool about the first movie and turned it into a made for syfy horror flick. The third movie was alot closer to the first movie and the book, as we are returned alot of the campy humor and finally see mobile infantry in power armor, as they were always supposed to be in. Fewer people know about the anime, which was decent but not really all that faithful to the book. There is also an animated series for starship troopers, which is pretty awesome in my opinion. It's closer to the book than the movie, and well worth watching.
The lord of the rings did a great job exactly BECAUSE they deviated from the book. If they had tried to follow every line word for word the second movie would never have been made because people don't want that crap. We don't need alot of the crap that is in those books for the story. I'm a big fantasy fan and I believe I have only ever read the books through about twice. It's another book that has a larger cult following than it's content deserves.
btw: the title: Movies that were better then the books should be Movies that were better than the books. As it is written, the movie is better and then the book comes out.