There are probably a lot of reasons why they’re not as good, and most of them seem to have their fair share of issues. But I can give you one reason that I’ve found to be evident across all of the tablets that I’ve tested personally and that seems to be present in the ones that I haven’t yet, going by the reviews: The fluidity and immediacy of touch response in the user interface.
The iPad, along with the iPhone and all of the other iOS devices with a capacitive touch screen, have an incredible responsiveness to touch inputs. The various elements of the user interface, or elements within individual apps all react to the touch as if they were ‘stuck’ to the end of your finger.
When you move, they move. When this behavior is absent, it’s stunningly obvious because, as humans, we all have a natural understanding of the way that things should react when we touch them.
It’s an integral part of the iOS experience and one so deeply ingrained that you may even be forgiven if you call it ‘magical’.