Interesting site that compares iOS 6 applications to their iOS 7 counterparts.
A few things stand out. First, while I dislike the look of iOS 6 applications, they at least look a lot less confusing than their iOS 7 counterparts – easier to read, clearer buttons, better contrast in the colour palette, that sort of thing. Second, many of them, like iOS 7 itself, are quite bright. I’m used to the darker colours of Windows Phone and Android, and iOS 7 is a heck of a lot brighter. Three, there’s a lot of Holo and Metro influences in there.
I have actually played with several of the iOS 7 betas, and found none of them particularly convincing. This look has a lot of growing up to do.