It's not
just a case of some people being "sensitive" (despite HarryT's insistence that this is the case?). It is a factor, along with the high expectations Amazon's press launch produced, but there have clearly been some quality control issues too.
There are some pretty discoloured looking screens:
http://imgur.com/gzTN0
Uneven lighting too:
https://www.mobileread.com/forums/sho...1&postcount=56
There are an awful lot more 'good' screens though, and if you were to have any problem, there's no problem to return it for a refund, or exchange it for another.