Funnily enough that's how I feel every time I use Windows or Mac. Yet I'm not bold enough to call them "piss poor". I'm pretty sure I - mostly - feel like that because they are different from what I'm used to.
Transitioning from Windows to Mac was much more of an adjustment than Linux Desktop. It's just that Linux has too many rough edges. While it's possible I've simply been unlucky, everytime I've tried Linux it's been small niggling issue after small niggling issue that I have to work around and it feels like a death of a thousand paper cuts. (BTW I first tried Linux desktop back in the late 90s and most recently used it as my main work laptop for 9 months this past year.)
Note, I'm more than happy to use Linux as a server. I run Linux servers at home and have for decades. But the desktop environments I've tried have all been irksome.
Note that I'm not mentioning particular distros or desktop environments because I've tried various over the years.
After all there are plenty of people - including me - who do not share that experience at all.
I had other issues that were not hardware related though. The desktop environment was missing some basic features for things like mouse settings that I had to install community extensions for, which were buggy.
I also had issues with printers, HDMI output, keyboard settings, and more. The list goes on and on. Each was something I spent time on that I haven't had to spend time on with MacOS (it's been a decade and a half since I've used Windows, but I remember it having fewer issues).
BTW, I also dread OS updates on Linux, and that includes server-side. Definitely another pain point that feels more severe than on MacOS.
Anyway, I'm glad that Linux works for some people's usecases, but it feels like it's been in this limbo of quasi-usable for quite a while from my perspective.