I finally opened my iPad and took grayscale/color temp/color gamut readings. As I sold my iPad 2, I ran over to a friends house really quick for a visual comparison, and his was much more blue in the white (which most of you would consider "brighter white").
I am not a professional calibrator (i.e. I do not get paid to do it, even though I may start it in the business I own). My equipment is "pro-sumer", i1 Display Pro that I Profile to a i1Display 2. i.e. not cheap. And is very very accurate.
Please don't think I am giving a "holier than thou" speech or anything.
All readings were taken with the white level (what Apple calls Brightness, SO SO WRONG) all the way up. Brightness is black level FYI.
I will start with the Color Temp. Proper color temp for video/HD video/etc.... Is 6500k. There is really no need for any other temp than that. A Cooler temp can look nicer for hockey (makes the ice blue).
As you can see in the graph, it is near spot on at each level of black/gray/white. 0 being black and 100 being pure white.
Grayscale:
Look at the bar graph for Delta E 1976.
The green line is 3, the yellow is 5 and the red is 10+. These signify errors in white (i.e. white looking red/blue/green). Anything below 3 you won't see, 3~5 it is very hard to see, 5~10 can be seen but still have to look for it. 10+ it becomes pretty obvious.
Again each reading is taken at a different level of black. So 0 is pure black, 10 is 10% gray, 20 20% gray ending at 100 which is pure white.
As you can see, the readings are great! If I was doing a TV, I would be very impressed and only minor white balance adjustments would be needed.
FYI, I can almost promise these readings would be better if I were to drop the "brightness" settings to a more normal level.
Ok now look at the RGB balance graph. That shows which color is giving the error at which particular reading of "gray". On a perfectly calibrated display all of the colors would look like a near solid line. As you can see green is the culprit here. BUT the error is pretty dang small. If the error was major the Delta E graph would sky rocket.
Gamma is pretty good too. But I won't get into that, as that is not the Topic.
Ok now for Color Gamut

This one will be a little harder to explain.
Gamut CIE Graph:
This represents where each color "falls" into the Rec. 709 (HD) color space. You want each color (dot) to be as close to each square as possible. As you can see, each one is nearly spot on. It shows you if according to the HD spec, if green is really green, or if blue is really blue. As you can see the Magenta is a little shifted towards blue (in other words, the magenta is "blueish"), but still very very close to accurate.
The Delta E 1994 graph, works the same way as the Delta E graph in the grayscale readings. Again as you can see it is excellent.
Gamut Luminance: This shows you if any color is over or under saturated. Even on some displays where you cannot completely correct the color errors, as long as one can get each color close to similar saturation the end result will be "decent".
It is near freaking perfect. Seriously, there are some displays that I have spent hours on and cannot get this close.
Anyways, we can all go back and forth. And everyone has a right to their opinion. But this data takes the opinion of "defect" out of the conversation. But know if you are returning your iPad in search for one that looks more like the iPad 2, you are returning an superior screen in regards to color/grayscale/video accuracy.
Oh and to those with complaints about the screen not being bright enough. I took a reading at 100% white with the backlight maxed. It read 108ftL. This is BRIGHT. Most displays (depending on tech i.e. Plasma/LCD,LED) are generally calibrated between 30 and 50 ftL.