Flippant, Dark, and Violent, but Kind of Clever
First off, if you think your young teens aren't going to see this, you are wrong. I had students writing about this movie in essays when I was student teaching. Is it neglectful parenting, or will finding a way? This movie has become a small part of teen culture and I think mature enough teens should be allowed to see it for that reason alone.
Zombieland is a dark, flippant take on the notion of a zombie apocalypse. It concerns shut-in Columbus, who survived the Zombie Apocalypse by being a polite sort of heartless. He ends up teaming up with Tallahassee, wild man who takes pleasure in two things: killing zombies in the most violent way possible, and twinkies. Then they meet up with Wichita and Little Rock, who are trying to get to Pacific Playland, where they hear there are no zombies. For various reasons, these four survivors adventure through the landscape, swearing, committing some inappropriate acts of violence, and indulging in various chemicals as they go.
The violence is almost all committed against zombies, but at least once an actual survivor is mistaken for a zombie and killed. His death is treated rather lightly. That, and the marijuana use, are really the most objectionable parts of the movie.
One thing I like about the movie is its balanced look at consumerism. Brands and product placement are prominent, yes, but in some ways the movie is about life without a society that demands those brands. All these leftover consumer goods suddenly become useless except the ones that can be eaten and fresh food--even fresh processed food--is becoming a concern. The movie shows just how much we depend on consumer culture and has some plot twists that show just how dangerous pursuing those pleasures in light of more pressing concerns can be. I'm also impressed with how the movie redeems four characters who seem to have no interest in other people, weaving them into a strange little family united by grief and a will to survive. For a flippant black comedy, this movie has some great messages. I just wish they'd handle the impact of death a little better.
And one last thing--aside from a few character's big mouths and the odd half-naked zombie, the sexual content here is relatively downplayed, and it is implied that Columbus wants a relationship more than sex but is so afraid of other people that he'll only pursue the latter. Given how many teen movies portray men as wanting nothing but sex, I think Columbus' attitudes are kind of refreshing.