If you want to get technical, defective actually means imperfect in form or function. A misaligned keyboard key is an imperfection, at least in form (and possibly even in function). All brand image aside, I don't care if you buy a Mac or a PC. Defects are defects and they're not acceptable to a consumer when they're spending hard-earned money on BRAND NEW equipment.
Would you return a pair of name-brand jeans that had a torn pocket you didn't notice when you purchased them? I bet you would. If you bought a $35,000 car, you'd expect to be built to the standards typical of a car in that class. You'd certainly be taking it back to the dealer for a flimsy piece of trim...
But to some of you, those who apply this same universal logic to a computer is simply being a nitpick.
When I custom-ordered a PBG4 several years ago, it arrived with a couple misaligned keys. At the time, it was a $3,500 machine. Did I pass that off as if "s*** happens? Hell no. To the Apple store it went for a keyboard replacement. I'd expect the same thing with an equivalent PC laptop. It's not just appearances I care about, it's overall quality.