Anecdotally, Yosemite (clean install) had an order of magnitude more breakage than Mavericks. YMMV. Perhaps we're so used to the unreasonable expectations of almost everything working that more breakage than usual precipitaes a whinefest "crisis" that gets picked up on TechCrunch as "news." That somehow Apple is "over" because of a few bugs that are fixed in the next patch release. (New releases are buggy, obviously. Best to wait for everyone else to sort them out or help catch them in beta.)