Hmm.... a number of points occur to me
1) Some of the complaints seem to be from people disappointed that Apple didn't announce cold fusion or perpetual motion or something
2) If you can't see why you'd want one, maybe you're not the target market
3) I've upgraded the OS on my iPod Touch with no probs (other than the cheek of Apple wanting money for it) so it will be precisely the same on the iPad, OS upgrades will be via the App Store, and will just work
4) I've spent the last 2 hours trying to get my son's Windows 7 laptop to connect to the internet, it won't, it comes up with some stupid 'DNS not responding' error all the time - it worked at xmas, it worked at his mum's, but not now. Web search suggests M$ recommend upgrading Windows - not easy with no internet access (my MacBook is working fine luckily, and my Vista machine had the same issue but fixed itself, which WIn7 will not).
5) I have a computing degree and I can't be bothered with all this computer fiddling crap. If the iPad just works (which it will, 'cos iPhone OS does just work) then it will be fine for loads of people who either are not very computer literate, or like me can't be arsed with it all any more
6) Basically, who cares anyway? In a year it will either be the thing everything is buying for xmas, or it won't. Unless you have shares in Apple, what's the beef?