It might be true, but this attitude makes it very hard for developers not to discount all complaints, including ones grounded in reality. Just because people are paranoid about new releases being crap, it doesn't mean that they are not crap.
Personally, I've experienced a number of really bad bugs in Yosemite. One of the most annoying is four-finger swipes to bring up launchpad: the "blur" animation starts and then just hangs midway, leaving a half-transparent launchpad that works with keyboard controls but not mouse-clicks. Or the infamous "backbreak", where you do two-finger swipes to go back in a browser window and somehow it fails mid-way, leaving an unusable browser page and breaking all two-finger gestures until you close that window (not tab, the whole window). And of course the awful dark corners on the volume icon once you disable transparencies, something you have to do to maintain a decent framerate on a two-year MBP-retina that was perfectly capable to handle all this up to and including Mavericks. And let's not even talk about the wifi dns bug, which I've lost any hope to see permanently fixed in my lifetime.
These are bad because they affect very visible UI elements used hundreds or thousands of time per day; the sort of thing that used to be rock-solid and did not significantly change in new releases. I would understand if a newish feature like Finder tabs had a few bugs, but not trackpad gestures that have been there, working fine, for years.