Well, going from the homescreen to an app and back again is the worst case with the animations, this alone begins to feel too much very quickly. Then you have this side "swoosh" in the settings, and the mimicking-real-physics motions in the multitasking interface - they're not really "wrong" as such, just too slow. I felt like the whole UI was working against me, that I had to push and prod it to get to where I wanted. Frustrating.
There's a good run through of most of it here:
https://www.youtube.com/watch?feature=player_detailpage&v=4ROpIognDiY#t=52
Also it has to do with the impact on the eyes that all this animation has - in conjunction with all the other clutter. The crammed together Command Center and the general appearance of these quite stark new icons for instance. Perhaps if the graphical qualities of the UI in general were just a tad less "much" AND the animations were faster, it'd be a lot better.
But, then there's also this kind of general lack of balance in the design. The calendar for instance, which I think is beautiful at first glance, but when you begin to put it to use, it also starts feeling a bit...much. Which in turn clashes with the design of the Reminders app. And then the step back in terms of "obvious" navigation, where clickable/moveable words have replaced symbols (like the swipe to unlock, on the lock screen).
It's all these things together. It just doesn't feel really consistent, not really confident - which is so unlike Apple. And there's just too much emphasis on style. One particular style as well, this kind of 80's inspired color set along with the stark, minimalist elements, which to me doesn't pack the same "general" appeal as the iOS 6 design language did (aside from the overly skeumorphic stuff).
My guess is this will all get much better within 6 months or so, with faster animations and revamped Reminders app etc. But they will be wasting time on correcting things, instead of using that time to move forward. And the real stuff we want them to open their eyes to - like customization of the Command Center - will probably not happen at all. - And all this while Google keeps getting their stuff more and more right with every release. I just feel like with iOS 7, Apple kind of tripped on their own shoelaces a bit while trying to catch up to Android, when they could have taken a scary big leap forward.
Not to worry though, the fingerprint reader and a Champagne color will keep the hipster crowd busy while Apple tends to repairs and keeps thinking about how to begin really innovating again.
What could get really interesting of course is if they find more uses for this motion processor, and iBeacon - the "inner" workings of iOS 7 that we aren't seeing nearly the full application of yet. But on the UI side of things... Like I said, I'm happier than ever to be using an Android phone, and more willing than ever to forgive its shortcomings. Because iOS 7 has far more of those.
