Here is the review I left:
1.0 out of 5 stars: Dark and Blotchy screen, October 10, 2012
By C. Jack Swinden "W5JCK" (Arlington, TX)
Amazon Verified Purchase(What's this?)
This review is from: Kindle Paperwhite, 6" High Resolution Display with Built-in Light, Wi-Fi - Includes Special Offers (Electronics)
The screen on my first Kindle Paperwhite was terrible. It had a dark blue green hue with large areas of shadows and blotches and blobs of green and pink. The text did not render consistently as some looked bold and some letters looked washed out. I could not read on it because it was so bad. I got a replacement sent to me and at first it was much better. But after a few days the screen has become shadowy and blotchy much like the first one did. It is slightly better, but not by much. Judging from all the negative posts I've seen on some forums, there are large numbers of the Kindle Paperwhite being returned due to screen defects. I think Amazon's quality control on the Kindle Paperwhite is really bad.
I will say that I've owned seven Kindles prior to the Kindle Paperwhite and this is the first time I've seen problems like this. Kindle Customer Service has been really nice, but too many units seem to be bad. I cannot recommend this product.