Our visions of what a tablet-sized mobile device should be capable of have changed considerably over the last 25 years or so, and although the iPad isn't voice-driven and doesn't have a bow-tie wearing host, it is a pretty remarkable step forward in computer interaction. But with all the hype, our expectations were high, and it's easy to understand why there's so much negative press surrounding the release of the iPad. In short, it didn't meet our expectations.
Historically, technologies are either accepted or rejected based on two criteria: 1) Does it do something MUCH BETTER than anything else that's already available, and 2) Does it work like anything else that's already available. Hopefully you agree that these are mutually opposing forces, so it's understandable why any innovation in technology must strike a delicate balance between the familiar and the radical. I would argue that Apple has done an excellent job of finding this balance.