This may be a believe or not post but thought I would post anyway...
Have had my iPad mini since Friday, must admit I am one of the ones who didn't like the screen. Coming from iPad 3 also have iPhone 5 and rMBP I just couldn't get my eyes to adjust but fully intend on keeping it since the other benefits of the mini outweigh the not so great screen.
Anyway, I was in the Apple Store yesterday having a look at the mini's and noticed their screen looked a lot better than mine (I used Macrumors to test). The text was much more clear. I even got my friend to look and then look at mine when we got home, she agreed the ones in store looked clearer. So I made a Genuis bar appointment for this week.
However, just out of curiosity, I did a hard reset on my mini and low and behold the screen looked a little crisper. Definitely a difference. I am going to take my mini to the Apple Store this week and compare side by side with the display models but thought this might be useful to some people. It might be a problem with certain screens so check it out before you return