I remember my poor LCII practically grinding to a halt under 7.5! Just awful. And that's my point; we've been here before, in fact I'd argue same as it ever was! With OS X, the first few releases were painful. Yes, Apple need to up their game on the quality of their software and (IMHO) the quality of their internet services especially, but this is nothing new. Perhaps the rose-tint is wearing thin?
I don't think anyone has claimed that the decline in Apple's software quality was unprecedented. Even if it happens every three years, there is nothing wrong with begging for a stable release once in a while. 10.8 will stop being supported soon and then we will be left with the choice between 10.9.5, 10.10.x and a brand new, unstable 10.11.0. High time for a stable release.
You are absolutely right. My point was that the hyperbole around it all in some cases seems, well, hyperbolic. Other than the mdns issue, both Yosemite an iOS 8 have been fine for me. Obviously others aren't as lucky, which really does suck.