I’m no designer, but iOS 11 looks wonderful to my eye. Big, bold text to denote each app. A move back toward real buttons. And, best of all, rounded corners. If iOS 11 fixed the faux-paper Notes background, I’d suggest it was a perfectly designed OS.
But according to Ryan Lau, we have a long way to go:
The unfinished feeling in iOS 11 mostly comes from UI and animation. UI elements in iOS are quite inconsistent, mixing a variety of UI elements, which might look quite similar but introduce a disconnected feeling for UX. The inconsistency of those elements majorly stems from those UI element updated in iOS 11, such as Large Title and new Search Bar. In my opinion, those newly introduced elements, which might be unfamiliar and new even to Apple engineers, have caused many inconsistent UI experience in iOS 11.
It’s hard to unsee Ryan’s complaints, but his might be a case of splitting hairs. Apple is gigantic, with hundreds (thousands?) of employees developing and designing a wide range of apps. Keeping consistency throughout is fair to be expected, but would be an accomplishment in itself.