Garrett Murray just bought a new MacBook Pro:
Arguing about the usefulness of pixels-per-inch in a display seems like a waste of time. If you want your computer to have the best display on the market, get the rMBP. If you don’t care, or you can’t afford to buy it, don’t. It’s not worth yelling about what matters more. It matters to me, most certainly, but I’m not you. But I don’t think it’s fair to claim a Retina display is meaningless technological masturbation.
This is, in a nut, the root of all consumer arguments. Why should anyone care what computer, or phone, or kind of coffee I spend my money on?