Don't get me wrong-- I like change, and the direction Apple is headed in with some of the UI changes (the calendar) look fine, but there are still a few problems with iOS 7 that make it look a little bit amateurish in some areas.
I really wish someone beyond Ive had the final say in the graphic design of this. That's really all I can say about it. The usability of the home screen and the new springboard are great, but the design is just... uninspired. Black and white and blue is not only boring but missing the subtlety that I admired in iOS of the past (skeumorphism aside).