I think iOS 10 is a beautiful, evolutionary refinement to iOS. I'm not entirely sold on the changes to the lock screen, but that's muscle memory and I'm relearning everyday.
It's my opinion that the people disappointed in iOS 10 are expecting it to be completely rebooted into something different like some type of macOS-Android hybrid nonsense. iOS 10 when finished will impress and overwhelm the expectations of new users and Android switchers and will be a familiar outgrowth for current users. As iOS 10 has matured I keep wanting more customization options, like letting us choose between a Dark mode or to switch back to the old lock screen.
It's my opinion that the people disappointed in iOS 10 are expecting it to be completely rebooted into something different like some type of macOS-Android hybrid nonsense. iOS 10 when finished will impress and overwhelm the expectations of new users and Android switchers and will be a familiar outgrowth for current users. As iOS 10 has matured I keep wanting more customization options, like letting us choose between a Dark mode or to switch back to the old lock screen.