Argh, lollipop's driving me up the wall! Vent time, woo! The thing I'm hating is that they've managed to completely screw up Chrome by getting rid of tabs and mixing them all in with your other apps, in an attempt to force you to use the bloody useless app switcher button instead of making it do something vaguely useful. And the lock screen, what the hell were they thinking? The amount of times I've opened the phone…
Part of this, is that even if you come up with a design that is better than what you have, it ought to be a lot better, because you're also asking people to get used to a new design. If it's just incrementally better, you're going to piss people off because you're asking them to relearn how to do something again, for no apparent good reason. I don't think it's unreasonable for a person to be annoyed by that.
And of course, if it's worse, or if it's only arguably better, or if opinions are very much mixed, then you failed.
This is something Google doesn't seem to know institutionally, or rather I guess they just don't care. On the opposite end of the spectrum is Microsoft, who care about this too much.