well, I might be a minority, but the new design still hasn't grown on me. I've been using it since beta 1, and I honestly kinda miss the old skeuomorphic design.
iOS 7 isn't bad, and in fact I do like some of the new design elements like parallax and gaussian blur in control center. The new clean lockscreen is very nice and has a modern look as well.
However, as of right now, all the animations just take more time to open stuff, and to me they're only fun for about 20 minutes. The new UI is too white for my taste, and apps don't have uniqueness anymore. That could be a good thing, but for me, I liked how notes was a notepad, how GameCenter had casino green felt, how Newsstand had wood shelves, and how Siri had movie ticket cards or scoreboards for sports. Now, all apps are white and doesn't set apps apart. I hope to see a black theme soon, at least it would be less distracting.
I know it's not the end of the world here, but I don't see myself liking iOS 7's design any time soon. And I'm not switching because I have invested in the App Store so much, and there is still some incredible stuff happening in the App Store that still isn't happening anywhere else.