Addressing a few specific ones:
> "What’s with the fly-in animation all the time?"
This has existed since the very first version of iOS. How is this at all an iOS7-specific complaint? The fly-in hasn't changed in any substantial way since the very first iPhone.
> "Especially for common workflow tasks like switching from an app to 1Password and back to the app."
Use the task switcher, which is now much faster than before? The task switching animation on older versions of iOS took eons unnecessarily (it was a very slow animation that "swapped" two cards). The new one is much, much faster. You're talking about an overall improvement in iOS7, not a regression.
> "Default wallpaper color theme is white on cyan."
It isn't. The default wallpaper on the GM/final build is a dark blue starfield, no contrast problems at all. It was only the cyan dynamic wallpaper in early betas.
Blah blah blah, the self-anointed aesthetique classe will continue to pick apart iOS7 in whatever ways they can find. In the meantime the world will keep using it, and people (Apple included) who spend more time developing and creating than bitching will find ways to improve it (like the community has improved iOS in the past - see: left-navigation, pull-to-refresh, etc). By far the biggest complaint I've heard from lay users re: iOS7 is performance on older devices. I've yet to meet a single person who despises iOS7's design as much as the self-appointed defenders of good taste.