I'm not stuck with Windows, I just prefer my Windows workflow over any other workflow. and no, I don't think GNU should be "praised". Without GNU (the "alternative to Unix"), Unix would probably not have fallen all the way down.

Indeed, OS X does not feel "unixy" at all, neither in terms of usability nor in terms of general system reliability. To be fair, OS X is very little unixy as of today, with all its weird GNUisms having been added over the years. Yes, Unix is proprietary, it always has been - so? Does that mean it's worse? It's actually better: If an operating system is sold for (a lot of) money, see AIX, chances are that its developing company will invest quite much effort to keep it going.

Linux has such a bad overall quality because no one really cares as it's free. They don't need to make sure that the sales will be steady over the next years because there are no sales.

Have you ever thought about why Microsoft hires security specialists to harden their Windows? Because Windows's quality is tied to actual money while Linux companies mainly make money with support, installation and other trivial things.