Who do we the people of the 21st century fear? In real life, it's the terrorists. In movies and TV, it's zombies. The combination of the two should be the perfect bad guy of our modern era.
The iPad/iPhone game Terrorist Zombies has a catchy title and a promising concept, but this is one of those combinations that doesn't stand up to close scrutiny. Consider the terrorist: he (or she) wants to run at us and kill us, yes? The zombie wants to do the same thing, just more slowly. The zombie might want to eat our brains, but the terrorist is also going in for the kill. Neither is kind.
Neither the zombieness of zombies nor the terroristness of terrorists makes the other a more formidable foe. But we wouldn't know this if there wasn't a video game that tested the proposition. Terrorist Zombies HD does that. That's what it's good for.