Sorry, but this old argument never washed with me. Certainly before Gnome 3 and Unity, the UX was considerably nicer than on my Mac, and in fact those old DEs are still much nicer to use than Yosemite, and the new ones are much worse precisely because they abandoned good design in favour of the Apple kool-aid.
I'm going to leave it there before the mist descends, but basically as far as I'm concerned Apple couldn't design a paper bag without fucking it up.
Where Linux sucked was in the distros' constant "improvement" of core features that weren't broken in order to be first past the post. For example PulseAudio was introduced before it actually worked with most hardware configurations, and nobody cared about the cool new features it came with. Ubuntu deciding to adopt KDE4 before it was ready for general release was another stupid decision. In fact, I'm basically talking about Ubuntu and Gnome.
Because they don't care about stuff like GUI. And it shows.