Kids are the judges of these devices. We are too tech polluted.
At my home, I have 3.5", 7", 10" ipad, 10" netbook, 15" laptops, and 22" desktops, and 32" TV powered by mini PC. My kids and parents prefer 10" ipad more than anything else, and hate 10" netbook most.
It's something beyond the screen size.