I haven't seen it yet, so I obviously have to preface it with that. But the audience reviews online actually aren't that bad. The reviewers don't like it and probably rightfully so. I think it is probably a case that with the story it is based on and the caliber of actors in it, it should have been much better. But if you take those expectations away it likely isn't a bad movie (still just an okay one though).
Also, the book is very good.