@CheekyMonkey said:

How is this possible?

It's a pretty good movie. Fun action. Good thrills. Rewatching it again in 2021, certainly gives it a different feeling.

I thought it was ok. I found it hard to engage with. Flat characters, etc. Zombie fatigue had already set in a while before this came out for me. But the zombie swarms were cool.

The book was better IMO. Really had high hopes and...was dissappointed. I rewatched it after buying the 3D BluRay super cheap, giving it a benefit of the doubt watch....it was "OK" at best, honestly! Zombie and too much CGI don't mesh too well!

Saw this in the theaters back during its original release. It was entertaining, but, in my humble opinion, ultimately a disposable summer popcorn movie.

Sci-Fi has to have SOME element of believability for me to latch onto, and I didn't really find that in World War Z.

My critique has been mentioned by others, but basically it came down to the "fast zombies". If I am to accept the premise of this movie, then I must believe that upon infection with a rabies-like novel super-virus, that ANYONE, virtually instantly, can become a top-shelf Olympic athlete. That means that a middle-aged "keyboard commando" commenting on a movie website, such as myself-- and I suspect that there are many of us here, along with the out-of-shape Dorito-chomping teeny boppers and a few even older senior citizens with chronic health issues --will suddenly be able to sprint across walls at breakneck speed while doing backflips and figure-8's. And also-- as long as they continue to feed --their strength will never ebb and their muscles will never fail.

Nope.

Same problem I had with I Am Legend (Will Smith, 2007).

Now, "slow zombies", which are infected with a genuinely debilitating illness, like in The Walking Dead? I can believe that (only problem there, with that particular show, is that it has now gone on forever. It should have ended after four to six seasons, with the zombies gradually dying off on their own for lack of fresh human flesh to feed on as the uninfected population continued to dwindle, until there is just a very small "normal" human population left rebuilding/living in a new world. But no, TWD had to become just another never-ending cashgrab television series).

Again, I found World War Z entertaining, but nothing more. Maybe a 5 out of 10 if I were to rate it.