Hmm, true. But, iOS6 (and previous versions) were all very stylish and mature seeming. Crisp lines and very uniformed, and that sold very well. Perhaps it's just change? I need to have a quick play around to be honest :)
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Might also be the fact that from the very first version of iOS (before they even renamed it to that) until iOS 6 it always had a similar style and didn't have a major UI change until now. I've had iOS 7 since they announced the beta for it. At first I was a bit "Hmm okay, not sure what to think" of the whole bright design. But after a couple of days/weeks I got used to it more and more. There is still room for improvements and tweaks in terms of the design and also some of the default apps but it is a good update in my opinion.