The Safari icon actually looks very nice, IMO. The low resolution image you're using doesn't do it justice.
I agree. When I first saw them on the low res streamed keynote, they looked pretty damn awful.
Watch the iOS7 video in high res or check out the high res pictures on the apple website and they look much much better.
The safari icon in the keynote made my eyes bleed, but looking at the high res pics (which is akin to what they'd look like on a Retina screen) the whole thing starts to make more sense. The colour pallete works and frankly some of the icons are pretty good.
I really like the Photos icon. And the Calendar, Notes, Reminders and Contacts icons.
I think all the icons with the big circle (Safari, iTunes, AppStore) the circle is too big relative to the size of the square, which makes it look a bit odd. That said, their overall design and colour scheme is pretty nice.