The Ending Ruins Excellent Production

Rating: 5/10 (1 November 2014)

I had read a strong review of Gone Girl in a newspaper at the release, then saw it corroborated with IMDb "10" reviews during the first week of release. I should have gone back to read more recent IMDb reviews before seeing it yesterday...which might have saved me from seeing it at all.
The production is excellent, the acting is strong, but the actors are stuck with what is a disaster of an ending. The key to the whole story is the state of Amy's mind, and I can't tell if we have witnessed her sinking into sociopathy or if she was always a psychopath. The demise of Neil Patrick Harris is unbelievable which pretty much makes the wrap up unbelievable. I sense Detective Boney sees through Amy's manipulation, but we are left to believe the detective is finished investigating.
I walked out seriously conflicted over what could have been an outstanding movie.