Rene Ritchie:

Stay away. And if you’re not going to stay away, be classy about it. Respect the NDA (non-disclosure agreement) you become part of when you install the software. Send bugs to Apple, not to the front page, and absolutely don’t post negative reviews for apps that don’t work or look well under iOS 7.

I’ve already seen pieces about how iOS 7 has a lock screen security flaw.