Okay, if you want to make a campy zombie movie go for it but at least be clever or funny. This is neither.
Okay, then what about scary? Nothing scary. These zombies couldn't catch a grandmother with a broken hip.
After the first ten minutes or so you'll be asking yourself, "What was the intent of the film makers? Not to scare me. Not to make me laugh. Not to put an effort into production values. Not to find capable actors. Not to make socio-political allegory. Not to... well you get the point. Stay away from this one.
I thought I would hate it but I actually liked it a lot. Elisha Cuthbert is quickly becoming one of my top five (not that that has any bearing on my review here) and there's a sex scene that is pretty smoking hot. But surprise, surprise it's not an exploitive sex scene. There's actually some refined taste here exercised by the film makers.
The biggest surprise for me was this: I think women will really like Captivity more than the other movies in the genre because this comes more from a woman's point of view and is much more internal in the way it deals with fear.
All in all I have to recommend this movie.