OS X Yosemite: I went back to Mavericks
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Change is hard, but if you go into it with this attitude you won't ever want to upgrade or try anything new.
Unlike the author, I have no issues running Yosemite on an i7 macbook pro retina with a 27' inch thunderbolt external display.
Time machine, I personally hated the previous interface. Always felt it was clunky and slow.
Icons are pretty poor but they are so small on my screen it's something I can live with.
The font! Oh where to begin, after using this font for hours on end now I thought I would have got use to it, but something just isn't quite right with it!
* beginning of wine-fueled rant *
Overall I personally am still in a mixed opinion on Yosemite, it took almost 2 days to get my work machines (iMac 2011 and rMBP 2014) back into a usable state. Almost everything was broken, network drivers (I use 10GbE), my IDE, VM environments, file sync, backups.
But worse of all they seem to have changed the mouse acceleration settings! As a long time suffer of RSI/Carpal Tunnel Syndrome I have learnt to manage it so well that most of the time I forget I even suffer with this. One of the best ways for me to manage it was to purchase a Razer Mamba mouse, which worked flawlessly in Mavericks. Installed Yosemite and the mouse was unusable even on the mouses slowest setting, tried another mouse, same issue. Completely unusable! After spending hours upon hours searching for a solution and setting my RSI off to levels which I couldn't sleep for 2 days! I finally found the USBOverdrive app which lets me control the accelerations to something which matches Mavericks. One week later I am still suffering with pretty bad pain in my wrist!
* wine-fueled rant over :)
That said I already prefer Yosemite overall to Mavericks and wouldn't go back.
Other criticisms I can't agree with. The removal of the starry background in Time Machine? Calendar icon being too thin? (agreed on Mail's icon though).
With those cosmetics out of the way, we come to the performance section. I'm just not seeing it, on a 2012 Macbook Air (I think this should count as a middle-of-the-road performer in the Mac lineup). I suspect there's something wrong with the graphics driver with respect to the writer's hardware.
Adding to that, I've owned two Mac's over a period of 3+ years and never once have they crashed. But today Yosemite just shut down all of a sudden. I've lost my confidence on Yosemite.
Or is there something you mean that the HIG doesn't include?