It's a matter of opinion. Not fact. Some love iOS 7 (Me, included) some hate it. Can't please everyone.
Personally, I love it, though there are some things I would change. I would definitely tone down the colors of the stock icons, and in fact, redesign at least half of them.
Still, with the transparency effects, we're able to influence the color of the UI by our selection of wallpaper, which is nice.