Hmm, I think this comparison of netbooks wants to disagree with your claims.
As listed in the table, most netbooks have substantially less than 10 hours of battery life, (indeed, only three entries out of 35 with published battery life estimates have an operational life of more than 10 hours), have a screen resolution of 1024x600 (which is *less* than the iPad's 1024x768), and, excluding the less-than-5" netbooks, weigh substantially more than the iPad's 1.5lb. Most are running 1.0 to 1.6GHz Intel Atoms, which aren't directly comparable with a 1 GHz ARM chip, so I can't comment on the "50% faster".
The iPad also doesn't use handwriting recognition for English (it's a standard QWERTY touchscreen keyboard), and you have the option of using a wireless Bluetooth (full) keyboard as well (this option doesn't even require any additional hardware beyond the keyboard).
So, I'd have to say that on several fronts, your argument about netbooks fails. Care to demonstrate what your "average" netbook looks like? Perhaps you'd also like to tell me how much it weighs, and what its actual battery life is like?