If you think all the other car manufacturers don't do the same thing then you're deluding yourself...
Back on topic, I am very picky about obvious flaws but even by my standards I think a significant number of people on this forum are snooker loopy with regard to the totally unnoticeable and inconsequential 'flaws' that they would have had to go out of their way to even find. Things like slanted keys, scrapes around the speakers holes, the lid being 1mm higher on one side than the other when closed etc etc, this all screams of being totally anally retentive.
The problem is that users on this forum find the most minor flaws and then jump onto the forum and start screaming from the rooftops about Apple's terrible QA and how these flaws are unacceptable etc. Then other people, who normally wouldn't look for, or even notice those flaws will go and look to see if they have the same flaws and then THEY join the screaming from the rooftops - it's a vicious circle.
I know from several people I know who have bought PC laptops - they take them out of the box, turn them on and it's only if something pretty obvious is noticed will they go and get a replacement (eg, screen faulty, keyboard key falls off, cracked casing etc). Point is, they don't go over it with a magnifying glass looking for the slightest defect.
Another thing to consider is that you're maybe more likely to have slight manufacturing issues because of the more advanced nature of the computer itself. For example, dell and other makers use cheap plastic enclosures - hard to go wrong there, but obviously it's cheap and nasty. Apple uses a new Aluminium unibody enclosure along with a different style of keyboard etc etc. My point is that when you're pushing ahead with newer and better ways of making a computer, it's easier for small defects to creep in, but the overall level of quality is higher than the otherwise tried and tested method.
You're buying mass produced items guys, there *will* be minor manufacturing defects. Apple doesn't say they make perfect machines, they claim to make superior machines compared to the competiton and I believe they succeed in doing so.