Maybe it was a idea of the marketing team to get everyone talk about the bad icons and in the end, apple changes them into sth beautiful and everyone is like ohh apple is hearing us and makes our wishes come true and do what the users want for the system
Haha.
But overall I like the design after few times looking at it. While watching the keynote I was like, yeah but some things... those arent apple like. There is way to much white in some apps. The buttons arent buttons anymore, okay, but they are not clear to be clickable.
For the icons: some of them I really like, some not.
Good ones:
Messages
weather (kinda like that,would be cool if it would change to bad weather)
clock (yeah why not? not much to go wrong here)
maps (flat but yeah? not that bad)
videos (kinda boring but can live with that. Never used my videos icon in ios6 anyway)
stocks (looks pretty cool)
newsstand (yeah like that)
passbook
compass (hm why not, looks not bad)
phone (like that the messaging/communication icons still look similar)
Bad:
Calendar (yeah pretty lame)
photos (not that bad, kinda misplaced)
camera (lulz some ps icon on some grey background?!?)
notes(nah boring and I have never seen notes with some yellow on top..)
game center (playful bubbles to be playful? Yeah its cool but why make everything flat and then some 3d shaped bubbles?)
itunes/appstore (yeah.. some weird sizes those circles and placement.. looks like there is more space between the top than the bottom)
settings (oh my god what happened with the cool looking gears? bah)
mail (boring)
safari (looks fugly)
Okay
reminders (yeah why not..)
music (exepct background)