I like Apple products as much as the next guy, but cmon, this is some serious kool-aid drinking here.
Apple doesn't produce software that is any less issue prone than any other vendor. In fact the chorus complaining about software regressions has been getting louder and louder, even from Apple fans.
Yosemite was a particularly low point with regard to Apple software.
http://fieldguide.gizmodo.com/the-worst-bugs-in-os-x-yosemit...
http://www.tekrevue.com/yosemite-bugs-time-for-another-snow-...
Software is hard. Apple aren't special, their software has just as many issues as any other vendor's, which is actually kind of disappointing given they have full control of the hardware, MS actually does a lot better with regard to software quality given the varied HW landscape Windows is deployed to.
Edit: Software quality isn't just a Yosemite issue with Apple, it's a long running joke that you should never install a X.0 OSX release due to bugs.
I don't think it's remarkable at all. It would be remarkable if they weren't getting better year after year.
What's the best Microsoft desktop OS? Which is the best Dell screen? Which is the best keyboard? Motorola phone? The current year's Apple lineup has always been better than the last year's, and that's what the "best ever" statements mean to me, and I believe that's what they mean to the target audience: "This is new, and it works at least as well as the old stuff."
Which other company, which other product line of comparable complexity, introduces features without compromising usability?