Not Bad Either
When I looked at the comparison between Old and New Icons on MacRumors, my first response was, "That new icon is ugly as sh**". But, when I updated the app on my iPhone and looked at the app icon of 'find my phone' over the old textured background of a folder, it (new icon) actually seemed better than old one. (I don't have iOS7 on my phone these days, so couldn't see the icon on it, though)
In the beginning, I was hating the flat look of iOS7, but, slowly started liking it.
I think over the time everybody will start loving it. Flat newer look looks neat and cleaner than older look, after-all.
Plus, the latest updated app icons and app interface is something worth appreciation for e.g. New YouTube icon and App similarly RetailMeNot App icon and App itself.