No... many people like the classic look from Leopard-Mavericks. I think either @Dronecatcher, @redheeler, or @jbarley was working on getting a mountain lion theme for Sierra...
Not to worry I'm not uploading. Besides all I changed was the icons and dock. I like the new traffic lights/progress bars/etc.
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I held out on Mavericks on my main computers for that very reason. In fact, my Mac Pro at work and my not-as-often-used 13" MBP are both still on Mavericks. I've grown more accustomed to the new appearance since upgrading my MBP to Sierra, but I also use dark mode and have dark wallpaper.
I do sometimes transfer wallpapers across various versions. I was never wild about the Mavericks wallpaper, so ran the Snow Leopard wallpaper on my MBPs(much to the annoyance of @LightBulbFun ). My main G5 has the Yosemite wallpaper in Leopard and one of the alternate Yosemite papers in Tiger. I do have to say that the last three versions of OS X have had some killer default wallpapers.
Back when I had an eMac, I used the Yosemite wallpaper in tiger and the mavericks one in leopard. Then I found mountain leopard and ran with the ML wallpaper for a while.