Entitlement... are you kidding me? I just want products without defective screens (or nicked bezels out of the box, or a freaking pebble in the camera lens for example), is that so much to ask for? I appreciate that I can exchange the product if it's messed up, but I don't have this problem with any other brand of gadget.
And to those saying stop buying Apple products then, I am... the Air will probably be my last as Apple's QC is lacking.
I'm not saying you're lying or anything. It just always cracks me up the authors of threads like this have had multiple (sometimes more than 10) defective Apple products - or they seem to always have a problem with their Apple device (i.e. the guy who's home button broke on his 5, also had broken home buttons on the 4S, 4 and 3GS).
Then there are those of us who have owned numerous Apple devices without nary a problem (I've had to exchange 2 Apple devices I've owned - once for a dead pixel and once for a defective processor - well into the first year I owned it).
My point being - these are mass produced devices. Millions upon millions are churned out every month. There are going to be issues. That being said, do you find it the least bit interesting that the SAME people always have problems? Or do you simply believe that ALL Apple products are somewhat defective and the millions of us who don't have any issues simply "settle" for crappy devices?
My guess? You have had some defects, but those defects are things YOU look for because YOU are extremely critical about such things. Same as the guy who's home buttons always break - what's the common denominator? I'd tell that guy to stop mashing on his home button so hard and I'll tell you to either buy some other device or learn to live with less than perfection.
And remember - you are one of millions (over 650 million iOS devices out there). Your 12 (or whatever the number was) defective products aren't even statistically significant. Again - either you buy something else (which, if you buy enough I'd guess you'll run into the same issues) or you learn to live with a small nick.
I'd also suggest waiting to purchase. Buying the first round usually means you'll have a higher chance of getting a dud. Also - why don't you simply open up and turn on the replacement while you're at the store? That way, if there's something wrong with it, you won't have to keep going back and forth.
Friendly advice.