I personally think that the new design is very pleasing to the eye, it's sleek, modern, etc., so generally I like it very much, and I'm also beginning to find the old interface kinda obsolete. BUT... there's one thing that really annoys me.
In the old iOS it could NEVER happen - no matter how you changed your home/lockscreen wallpapers - that it went to the expense of readibility. The on-screen elemenets were so well designed that you could set any stupid picture as your wallpaper, the icon names, the statusbar, the time, everything on the lockscreen, they remained perfectly readable. But now, just try to set any bright picture as your wallpaper (there are plenty of them even among the default ones!!!), it's CHAOS, it's pain to the eye, you can hardly read the time on the lockscreen, let alone the statusbar...

Why did they have to do this?? Why was the prettiness in this scenario more important for Apple than the functionality?? Why haven't they used some foggy layer underneath, or anything, whatever, why haven't they thought about this... Honestly, that is my only serious concern about iOS 7, and maybe the somewhat hard-to-use calendar (confession: I actually find the old iOS calendar to be more usable

).