Actually I think people who have NOT read the book will enjoy the film more... because what the film also missed (understandably) is the complexity of perspectives- Nick as he sees himself, as Amy sees him, as the world sees him... and same for Amy- also Rosamund Pike became somewhat a unidimensional Amy... not taking away from the film though- it managed to capture the overall um... let's say... feel of 'Gone Girl' quite nicely....
Actually I think people who have NOT read the book will enjoy the film more... because what the film also missed (understandably) is the complexity of perspectives- Nick as he sees himself, as Amy sees him, as the world sees him... and same for Amy- also Rosamund Pike became somewhat a unidimensional Amy... not taking away from the film though- it managed to capture the overall um... let's say... feel of 'Gone Girl' quite nicely....