I ended up watching it yesterday and I'm glad that I did as it was pretty entertaining overall.
It's one of those obvious 'reverse poker tell' plots though, where weakness means strong and strong means weakness. So it was pretty clear early on that the husband was the bad guy and she was the good one, while I still stayed interested in how exactly it would manifest.
I see this as the right kind of good B-Movie, but nowhere near as good as something Like Gone Girl which it reminded me of in a way.