MacOS is a close second, with a few native apps that can't decide exactly what a checkbox or a button should look like.
And Win10 on my wife's machine is a salad, reminding me of Linux desktop experience from 1998.
This is pretty funny, because if you just use Gnome apps + desktop environment, you have a consistent experience. But if you only use Microsoft/Windows GUIs, panels and applications, it nowhere near as consistent.
So even the Gnome team can build better UI and UX than Windows themselves can, pretty telling.
People like to hate on them, but their design is actually really good, innovative and the applications running on GTK are incredibly fast and stable.
I also hope that, unlike MS, they have no infighting between departments, and no stack ranking.
I'm not complaining/hating, Gnome is my desktop environment of choice since some time ago.
Was more a nod to how awful Microsoft seems to (still) be at UI and UX.