Zombie movie with a twist

Rating: 6/10 (1 October 2013)

This zombie movie added elements of modern warfare that is rarely seen in other zombie movies.
There is one thing that bothered me. In the movie, the zombies are attracted to sound and they come running towards the source of sounds.
Somehow, when the sound is made by one of their own, they don't come running. How can they tell whether a banging sound is made by a zombie or a human? And nobody ever investigated how the zombies could tell a zombie from a person. If they did, perhaps they would find another way to fool the zombies.
Also, why don't the human just bombard them with sound to confuse and distract them? I can't believe not one person in this movie thought of throwing an object away to distract the zombies until near the end.
Just because Brad Pitt is in the movie, doesn't mean it's a good movie. The movie was well edited and maintains a good pace. I never feel the urge to fast forward, but then I have a preference for horror movies.