If they replaced your device it couldn't have been very minor. You also seem to be glossing over the fact that you have had issues with so many Apple devices. I'm not trying to pick a fight, but instead of praising Apple here maybe you should be questioning why 4 of their recent devices gave you problems to begin with.
When you have a big immediate family and everyones got 2-3 apple products its possible to have issues.
iPhone 4S - We thought it had a issue with the microphone as sometimes people would tell us that they can't hear [maybe it was network] but apple replaced it without question - then we moved and never had the issue again.
iPad 2 - Mine - It fell off my lap - I didn't have a case on it so the side got dented slightly causing the volume button to get stuck - - luckily I found a slight amount of light leak in it and that was reason enough for apple to replace without any hassle.
iPad 4 - My nephew when removing the plastic off the brand new unit, accidentally chipped the 30-pin dock connector as he was doing it with a pen [trying to poke a hole in the plastic cause he didn't want to remove the whole thing until we got a screen protector and case for it] - Apple replaced it without a question.
iPhone 5 - I wanted the AWS Compatible A1428 model, so I walked into an Apple Store and explained that because I bought my 5 at launch, its not compatible with T-Moible's AWS bands, again within 5 minutes I walked out with a replacement iPhone 5 w/ AWS support.
Now you tell me, based on the "issues" should I praise apple or should I say they did me no good? because I'm 99% positive any other manufacturer would make me go through loops to get a replacement for such things that we experienced.
Not picking any fights, but you need to see above and beyond to truly appreciate Apple's support and willingness to tend to its customers experience. No company is perfect and I know apple isn't either, but since launch of the iOS products, all I have seen is Apple truly win me as a customer by offering me the absolute best customer service experience [not to mention I am very knowledgeable regarding all things Apple, at times I possess more knowledge than their own staff and tech support]
Also I'm hoping with the true value of the iPhones coming to light of those that never looked at it, people will be more careful with their devices. After all, it only takes little bit of care and things last forever.
With iPhone having one of the highest prices, people will truly appreciate it rather than looking at it like any other phone within the $200, $300, $400 price range [due to subsidy's]