It's no game. You have to assume that someone is, or will be, trying to crack your password. There are threats out there many of us aren't aware of, and sooner or later, by some means or other, most of us will be targeted. Maintaining strong passwords is critical in defending against attack, whether it's by someone who bears you or your company ill will, a criminal enterprise that wants access to your bank account, or a brute force password-guessing attack by a relentless computer program that wants to commandeer your computer for use as a spamming robot. (Can you tell I've had some relevant personal experience?)
Burnett writes in plain English, illustrating his concepts with examples, analogies, and stories from his career as a computer security expert. You don't need to be technically minded, or even especially computer-literate, to understand what's in this short book. Anyone who uses passwords - and that's pretty much all of us - could benefit from a sprint through Perfect Passwords.