The acting is mostly terrible (except the little girl who is excellent for her age) The characters do completely stupid stuff like wait for ages, staring before they take any action like run away or block doors.

Punching zombies in the teeth with bare fists seems to be a winning idea & some zombies die by simply throwing them a few feet.

From about 30 minutes in, every 10 or so minutes involves a scene where a protective door is shut JUST at the last minute.

The way the film ends is so annoying, considering you've just sat there and watched pretty much the same thing over and over for 2 hours.