99% of people who have a vehicle (in US) use the DMV of some sort in some capacity, there's also no huge organized outcry about the DMV system on the news or newspapers and so forth with anyone coming out to calm the masses or do something to actually address much of how things are done at the DMV, however, since something on the order of 99% of people use it year after year that must mean that the majority of them are satisfied with it all.
There are all kinds of ways to look at all kinds of numbers, but the actually meaningful ways are the ones that use the numbers for what those numbers were actually designed for.
I see, so rather than combat everybody's post who feels positive about iOS7 by coming up with scenarios as to why much of the 87% adopters may not be happy, why don't you just come out and say you don't like it. It's pretty obvious.