Not as bad as some say.
I actually found this film to be entertaining. I think it was a good exploration of how people act in a crisis situation. Normally rational, functional people become paralyzed by things they can't understand. They can't think or make decisions, thus they act without thinking. They mutter mindlessly to themselves and others. Some become irrational and violent, so that they turn on one another's hen it is actually in their interest to cooperate. Many people have an extremely powerful instinct to follow that becomes irresistible in a time of crisis.
But then again, I am reading too much into the film. It wasn't perfect but I saw things in it that I liked. I give it 6/10.