No one watches zombie movies...
in zombie movies.
I know this is nitpicking, but doesn't it bother anyone else when the characters in movies see another person running at them (or stumbling) while covered in blood and screaming that it just might be a zombie? I know these aren't REAL zombies, but the question remains. I figure that by now everyone is aware of what a zombie is and that whether it's an infection or supernatural source, it's probably contagious through biting. But again, we see in this movie people are like, "Oh, Joe! What's wrong, mate? Let's have a hug to clean up all that blood dripping from your mouth!" Of course, not literally.
All I know is that if I saw any family member or friend uncharacteristically running at me with blood spattered all over them and howling, my first instinct would be, stay the fark away from the teeth.
P.S. I'm surprised no one has mentioned Resident Evil (be it game or movie) as providing material for this movie's story. You know, heartless corporation making a super drug that turns people into zombies, etc. I still had fun watching it.