I've always loved all things end of the world. The neat-o graphic up there is someone's screenshot from Fallout 3. (Fallout 2 is the best.)
There's something sexy about post-apocalyptia, be it via zombies or nuclear holocaust. Not alien invasion so much, that's too Us vs. Them.
I like the depictions of the state of humanity after the world has ended. Left to our own devices with survival as the main goal, you always get the self-serving assholes like the Lord Humungus or Tina Turner to foil the reluctant hero Max Rockatanskies and Vault Dwellers. Like, oo who is our greatest enemy? That's right. It's ourselves.
Plus, aren't we getting lazy? I've been jobless for two months and ask me if I've felt hungry or uncomfortable. I don't have health insurance, but do I worry about injury? Nope. Where's the struggle, the Darwinian Fittest in life such as this? Give me a zombie outbreak, let me see how that goes. Give me leather-thong wearing bikers trying to steal my gas and see if I can dispatch them with badassery.
I know what you're saying, "Seth, why not just move to Somalia and try to Schwarzenegger in Commando all the pirates or somesuch," but wouldn't that just be a choice? A poor one? Let's see how it goes down when it's mandatory. Then you can really put your heart into it.