sorry to borrow your post but that word in bold is very very important.
One thing i've noticed over the last four years or so of wandering around apple boards is that some of the more, uh, dedicated fans have incredibly high expectations of the company and its products. There are times that i think they'd complain if someone found a problem with an apple product that only manifests itself when the device is held upside down, on a tuesday, while someone sacrifices a small goat with, and this is important, a black dagger to cthulhu.
At the end of the day you may or may not be bothered by a particular issue. If you are, take the device back, get it looked at and either repaired or refunded. Apple has some of the best customer service around so make use of it. If you don't notice it or don't find it affects you then keep calm and carry on. Simple. Speaking as someone who has an ipad 1 that does, indeed, have a minor lightbleed issue... I don't give a damn about it. Why? Because in almost a year of owning the device it has never, not once, been a problem. It's never affected how i use the device, it's never made me think i've been ripped off or need to get it repared. Frankly if monitor manufacturers were held to the same standards being suggested here you'd see prices tripple overnight. In fact i can't remember the last time i saw any monitor without some sort of issue... Maybe, just maybe, one of the two grand eizo units we have on the design pc's in work. That's about it though.