I watched it over the weekend and thought it was pretty good. Saw pretty quickly how you it can be seen(and go crazy), with people not believing you when someone is stalking/terrorizing you.
The only thing I didn't really like about it other than the odd ending
HanSolo2187 mentioned above was when the stuff in the attic happens and she has evidence that she's being messed with. That being said, things escalated VERY quickly just before, when and after that so I get it, but still. If you're trying to prove your dead ex may not infact be dead and is messing with you and you get evidence that it's true I'd be holding onto that and show it to my cop friend as soon as that stuff settles down.