This is as clear and concise a statement I have found on why this is it-
1. It is SO SIMPLE. It is basically a highly responsive capacitative piece of glass with solid state memory and an IPS display. Just as a book is basically paper bound together in a portable form factor. The simplicity is what allows everyone, us, software developers, content providers and accessory manufacturers to pour themselves into it, to remake it according to the limits of their imagination. I’ll stop before I get too Disney.
The book analogy is a great one, also ironic since the iPad is also intended as an alternative to paper books…
Another really cool nugget from the article by Stephen Fry-
“I have always thought Hans Christian Andersen should have written a companion piece to the Emperor’s New Clothes, in which everyone points at the Emperor shouting, in a Nelson from the Simpson’s voice, “Ha ha! He’s naked.” And then a lone child pipes up, ‘No. He’s actually wearing a really fine suit of clothes.” And they all clap hands to their foreheads as they realise they have been duped into something worse than the confidence trick, they have fallen for what E. M. Forster called the lack of confidence trick. How much easier it is to distrust, to doubt, to fold the arms and say “Not impressed”.