Well, if we're talking visually, then I'd have to disagree. I think every iteration of Mac OS X or macOS that I've ever touched has looked very nice, and quite professional.
If, on the other hand, we're talking functionality, then I'd be more inclined to agree. Apple cherry-picks stuff they didn't invent to include, leaving out the rest, including things which wouldn't even cost them any money. Windows is marginally better in those respects, but honestly nothing comes close to what most of the major, mainstream Linux distros offer. Beyond that, Cinnamon really incorporates the best bits of what Apple had with Classic Mac OS and the Aqua environment, and those few "really good" bits found in Windows 95-7. Picking the "English (intl., with AltGR dead keys)" keyboard layout as the default then completes matters.
At best, macOS occupies a niche market space, and does not begin to compete with either Linux or Windows outside of that.
My greatest regret is that I bought my M1 MacBook Air. It's a very beautiful and elegant piece of hardware — and in my view the M1 represents the next wave in CPU architecture — but had I known about Apple's little backdoor project, there isn't a chance in hell I'd have gotten it.