I've been reading a lot of books lately and some are movies as well. One novel I recently finished was M*A*S*H, which was first a book then a movie as well as the TV series. The novel, I thought was awesome and the movie, came close to it.
Another, that comes close to the novel, is The Hunt For Red October by Tom Clancy. One movie that didn't even come close to the novel in that series, was The Sum of All Fears. Good movie, but WAYYYY different than the novel. Stephen King's The Stand, a good miniseries, but not as good as the book.
Another one, Starship Troopers. BOY that movie was nowhere similar to the book at all. I've not read the Harry Potter books so I don't have an opinion of those, or even Twilight.
I would love to know, fellow ADISCers what you all think of movies vs the original novels.