Comment by ant6n

There are also a bunch little of usability bugs related to selecting, copying and pasting text. The auto-complete has become more adversarial then helpful. There are bugs related to search in pdf documents in safari. There are (or at least were until recently) bugs when searching for settings in the settings app.

Can't think of any more at the top of my head ... it feels a lot like Windows, where there are a bunch of eternal bugs one just sort of knows and works around, even though it's a kind of shitty and occasionally very frustrating experience.