So often people review technology on the basis of improvements in specs (CPUs, RAM, benchmarks, etc) rather than by examining the use of a device.
Gruber focuses on quantitative, iterative improvements to the iPad's components. He goes on and on about weight, thickness, Geekbench scores, etc.
Baker focuses on the user's experience: how do people use this thing? What problems does the iPad solve that aren't solved on other devices? How are these problems being solved -- or ignored -- by the latest update?
I could be wrong. But I seem to remember that a lot of the Apple side of the "Apple vs PC" arguments of yore focused on "how is it used" rather than "who has the fastest CPU".