ehhhh... seems to be what's in fashion now. Doesn't affect anything and you can always still change the skins if it bothers you.
My big beef is that all of the new features look great and useful (same with mavericks+lions) but the system as a whole is just too buggy (at least it seems to be) compared to 10.6... I spend about 90% of my time in 10.6.8 and only rarely boot to 10.9. One of my biggest beefs with the new flavours is, SMB doesn't work with my xbox.
I would like to use the latest and greatest (and sure, I'll admit, I like the way it looks in it's own right, but I still like the way 10.5/10.6 software look "matches" the hardware even more). The new features like the cloudy stuff and iphone integration (sms in messages, answer a call on mac, etc) are nice but it seems apple can't quite get the stability back that they used to have. The annual release cycle put a damper on it. I really wish they would just put that icloud stuff in an extension rather than the system itself.
If a 3rd party app re-introduced most of the icloud features to snow leopard, more people would still be using snow leopard.
ios is apple's focus now... I'll bet in a few years, mac will be nothing more than the dev platform for it. All good things must come to an end and OSX is no different
But there'll be a clamshell iOS laptop with keyboard and A-series processor to make up for it. Just my opinion.