Characters behave so unrealistically
My suspension of disbelief was completely shattered after the second zombie meeting, and just continued to be trampled on throughout the movie. The average man wouldn't sex a random willing hooker in a basement, much less in front of his friends, and much less a half-sentient decaying zombie. I mean, come on.
The movie looked alright, sure, but that's about it. Oh, and TJ's speech at the end was so heavy handed. "It's us vs to world man! This is totally justified, we have control here!" Ugh.