I saw Gone Girl yesterday. Wow.
I haven't read the book, so I can't comment as to how faithful it was, or which was better. But I will say that what I saw on screen took me on a wild ride. The plot had twists I didn't see coming, the pacing maintained the tension, and the performances were multi-layered and compelling.
As one who watched the Lacey Petersen/Casey Anthony/Jodi Arias trial obsessively, I loved the wise and funny way Nancy Grace was handled. As my friend John once told me, "she is to news as wrestling is to sports."