Earlier quoted context omitted.
Mavericks introduced a lot of tangible under the hood improvements that perhaps you missed, Ars did a thorough review, perhaps start with how the OS was changed to improve energy consumption: http://arstechnica.com/apple/2013/10/os-x-10-9/12/#energy-sa...
Yes, linux geeks can school Apple on systems engineering when they can deliver laptops with a better battery life than Macs get. As for this latest release, what, adding a new systems programming language and a whole new graphics API isn't enough? At least my Mac recognizes and uses a second monitor when I plug it in, unlike the bloody Fedora 19 box that I use at work. And don't get me started on that second graphics…
Well Linux gets better battery life on my laptop than OS X. (11 hours with ubuntu gnome 14.04).
> my Mac recognizes and uses a second monitor when I plug it in
Not mine. And this is a common problem: http://www.imore.com/os-x-mavericks-problems-drive-me-nuts-h...
Also, I had issues with sound going out and not returning until after a reboot on OS X. This drove me nuts.
Thing is your points only apply to OS X if you run it on Apple hardware. If you get ubuntu certified hardware you will have no problem running ubuntu either. Ubuntu is going to run on more devices with less issues simply because the linux kernel is designed to target more hardware than the OS X kernel.