Just got back from it. I don't feel like doing a full write up on it, but I'd grade it a B+. I liked it more than I thought I would, it had a lot of good moments in it and actually made me interested in spite of me quickly losing interest in the zombie genre of films. I've not read the source material but from what I understand there's a LOT more this movie could have explored, possibly in a series of movies. But as a one-off it worked.
Here's a question? Did the camouflage infection have to be deadly? As-in "this will fuck you over" deadly? Hell, the FLU can be deadly, why not give yourself that? Because while it's deadly it's also entirely treatable for a healthy person. Did it have to be something less treatable like meningitis or something like that? Also, I would hope the WHO stores and labels their vials of deadly viruses, diseases and bacterias better than "Yeah, don't take one from cabinet C."