I've watched this again recently and found it enjoyable, I like a good zombie film.
It got me thinking though, so many blatant plot holes, ones that hinged on the entire denouement too.
So Pitt's role, Gerry Lane, pieces together that the zombies need healthy hosts or they ignore them. He notes this first from a soldier in South Korea with an injured leg, an elderly man & young man apparently with cancer that the zombies just avoid.
But then in the finale, when they are trying to prove the theory by obtaining a pathogen to infect a human with to see if the zombies ignore, Gerry and Segen are still very much targets for the zombies who go after them like anyone else.
However, Gerry had recently been in a plane crash and had a metal fragment spear him right through the side and he was still very much in pain with it during the finale. Segen had had her hand amputated to avoid the infection turning her into a zombie and again was still in pain with it. Yet they were still targets for the zombies despite having severe injuries when the zombies previously ignored a soldier with a limp and didn't attack him.
How did they not notice such gaping holes in the plot. Surely a more logical way to do it would be for the zombies to ignore both of them in the lab anyway proving the theory. Just seems so stupid.