For every single one of your points, I have a counter-example that is positive to Ubuntu. Seriously! So, its really neither here nor there, in my opinion.

For the last two years I've found Ubuntu Studio a superlative OS to be running on both MacBooks and generic PC workstation/laptop hardware, and I've found the condition and quality - and overall user experience - of both MacOS and Windows to have gone rapidly downhill by comparison.

So, I dunno. You say tomato, I say Ubuntu is awesome.