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Ladies and Gentlemen, whether you like it or not, Yosemite has surpassed Mavericks in usage. If it levels off in the low 40% range an issue may be able to be made that it's not really accepted, since more than half of Apple's users would be on older OSes, but the curves imply, at least to me, that it will likely completely displace Mavericks.
With all due respect, I fail to see the correlation you and a few others attempt to make between installation rates and approval rates.
An updated Mac operating system like Yosemite and those before it is not comparable to, say a newer model of your automobile, where you get to go into the showroom and look it over, slide behind the wheel, take it for a test drive and then go home and think it over before deciding whether or not to trade in your existing model. Nobody hauls away your present automobile while you are trying out the latest model over the weekend!
Nor is it like a product bought online from, say Amazon where you get it delivered to your home, open it up, try it out and have x number of days to return it for a refund with no questions asked. The UPS/FedEx guy doesn't enter your home and take away your existing gizmo while you try out the new one!
No - an update to the Mac operating system is offered by Apple and downloaded and installed by the Mac user solely upon the basis of loyalty, trust and a lengthy string of prior wonderful and positive experiences that each update is going to be terrific!
In this case that loyalty and trust has been misplaced, and it is no simple matter for the majority of Mac users to reverse course and restore their Macs to its prior condition! And it really takes working with it for a week or two, thinking positive and hoping for the best, trusting Apple, before one realizes just what a shocking disappointment this "upgrade" really is. And by that time, aside from a small percentage of highly proficient techies, the majority of betrayed users feel helpless and not up to the task or perceived risk of trying to restore their former version of OSX, be it Mavericks or an earlier version.
So the fact that an avalanche of Mac users have downloaded and installed Yosemite is no proof whatsoever that they are happy or satisfied with Yosemite's appearance, performance or utility.
To the contrary, it appears that the more that the number of installations of Yosemite grow, the more anger, disappointment and frustration is being expressed. Captives may be resigned to their captivity, but that hardly reflects satisfaction with their predicament.
Etan