This whole iOS 7 thing is in my opinion, is a change much like OS classic to OS X. It harnesses everything great about the operating system and 'revolutionises' it.
Personally, i love it. and there are many reasons why...
First of all, although this has been made, cartoony and simple. it has that essence of design and thought. I know at the first look it is like, BLIMEY! someones been smoking something when that idea sprung to mind... but it seems to work and work well.
I think another main reason this colour change has been made is that it can be made personal by simply changing the background image. this will the coincide with this so called iPhone 5s in multicolours.
But then there is all the features that were always there, but have been made that little bit better by taking out everything you don't need and simplifying it. as simple as removing the camera shutter has made the camera at least twice as fast with taking photos.
I love the new notification bar, it makes the old one look ancient, and the addition of the control centre just polishes off a nice bold new system.
I do agree that there are some things wrong with it though, i just hope these can be fixed. The thing i hate the most is the calendar. This is an app that i thought was simple enough to use, but they have made it better looking whilst stripping out its functionality. by having a simple dot on the calendar, it was easy to see that there was something happening, so id click it and a list would appear below. now i have to check individually and then scroll through the time of day. this is very unproductive and just a plain old... how can i put it, fail.
overall though, most people that will try iOS 7 will enjoy it. i like not having to have my brightness set high

some battery savings there i tell u!
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Too windows like...