You're looking at them wrong.
These icons are actually great, so everyone shut up, you're looking at them wrong. I don't have ios 7, but i'm pretty sure this is what happened:
7 months ago...
In a small room at apple hq, johnny ives and co are discussing the removal of skeuomorphism. The great thing about skeuomorphism is that it describes things well; icons look like physical buttons with shading/gradient, and users know what they are immediately. The big problem was "how can we convey 3D depth to buttons/icons without the use of skeuomorphic design?"
Some time past...
The answer was to convey 3 dimensions in a different way, through the use of transparency, layers, and by utilizing the phone's accelerometer to move the background image. Pretty brilliant.
Currently...
Apple posts a photo of ios7 icons on their website with a white background (with faint transparency marks). People loose their ****. But they're intended to be looked as on top of a background image, and when you see that, i'm sure they will look stunning. The neon will stand out, they will convey properties of an icon, and the transparency will look modern and fresh.
Also, I bet Ive's has final say on icon design and for whatever reason the ball was dropped a bit. iOS7 was made in just 7 months. I bet they'll change some of them for congruity.