87% of iPhone users have installed iOS7 but it is almost certainly the case that the vast majority just upgraded due to there being an alert in their settings menu telling them to do so. It is in no way any vote of approval for iOS7.
Those that held back were then told that there was a security vulnerability and that they HAD to upgrade to 7.0.6
Some of the 13% remaining probably researched articles on iOS7 and decided against it, despite the security flaw in their older o/s.
So yes, there are some people very happy with iOS7. That is indisputable, but I'm afraid there is no way of knowing how many MILLIONS of users wished that they had stuck with iOS6.
A fair few posters in this forum dislike iOS7, they are certainly less than half but definitely not an insignificant minority. Considering that most posters here are techheads who like the latest kit, it is no surprise that the newest = the best.
Performance-wise, that isn't necessarily true and numerous threads lay testament to this.
I'm sure iOS7 will come good and by the time the iPhone 6 is released, most people will have forgotten all about iOS6 anyway. Times change and things move on. Sadly though, whilst people still have how their current device performed with iOS6 fresh in their memory, a lot of cellular contracts are going to have to see their course before this buggy, bright white and childish-looking o/s becomes accepted as the norm.