Didnt say perfect...Said perfectly good...not much is perfect in this world, which is what makes it an interesting place.
As to the color temp variance(but still uniform on any given screen), that is not an issue...that is a by product of using different screens from different manufactures, and they are calibrated differently...same as light bulbs. Some people prefer a warmer color temp, some cooler...that is not an issue, as long as it is uniform across the screen. That being said, would be nice if we could calibrate the screen like with our computers.
I know you didn't use the word "perfect" but a lot of people on this forum have been dragging out that word, which kinda irks me. That's actually why I signed up to talk about it.
My iPad doesn't have color uniformity, as most don't -- one quadrant is a very slightly different shade than the rest -- but I have to stare at the thing and nearly make my eyes cross to notice it. I'm somewhere in the middle on this. I know a lot of people wouldn't notice it at all. Some others would've returned my iPad if they were the owner.
Anyway, I agree with you about screen calibration. Different people have different tastes. It would be great if Apple would add the same ColorSync calibration wizard to the iPad that exists on the Mac.