You're probably used to hearing — or saying — that a film adaptation of a book is always going to be worse than the book. While this is true pretty often, it's not always the case. Some movies are actually better than the books they are based on!
Welcome to Fight Club. The first rule of Fight Club is: you do not talk about Fight Club. The second rule of Fight Club is: you DO NOT talk about Fight Club! Third rule of Fight Club: someone yells "stop!", goes limp, taps out, the fight is over.