Daring Fireball: Digging Deeper

And so what makes Microsoft’s new “I’m a PC” commercials so jaw-droppingly bad is that they’re not countering Apple’s message, but instead they’re reinforcing it. That the spots themselves jump between dozens of different people who “are” PCs, that the spots make a point of emphasizing that there are a billion Windows-running PCs worldwide, this only emphasizes that “PC” is not a brand name but a generic. - John Gruber