Raph Koster once said he became disillusioned with games because, after working to come up with a method to universally describe them, he realized that they're all basically math. And that's yet another reason why story games are so freaking cool - they aren't. (Well, technically they are, because the universe is math, but you know what I mean.) With D&D it's pretty easy to see through the story through to the underlying math. But with some of these story games, it's the story that matters - the math just pops up on occasion in service to the story, to resolve disagreements or escalate.