What a disappointment, the plot is poorly written and the flow of events were completely predictable, looks like zack forgot to pay someone to fact check the details and consistency of his film because none of them made any sense, literal nonsense, i understand that its a zombie film and that there are leniency with facts, but man seriously? It seemed like it was written by your 10 y/o nephew who was really into oceans eleven and resident evil (the horrible mia jovovich ones not the animated ones), to be fair the action sequences are decent but this movie is less zack snyder and more paul w.s. anderson.
Do yourself a favor and rewatch zombieland instead.