I disagree. The sharp corners might not be the style everyone favors, but it's still the best phone UI I've every used. It elegantly solved the tooltip problem, is the only mobile OS that feels 100% usable for left-handed people like myself and everything is consistent throughout the whole system including third-party apps.
And neither Android nor iOS can compete at text input/editing. It feels like Microsoft put more thought into that component alone than Google does for an entire major Android update.
Yes, it also had a fair share of weird quirks and weaknesses. But in my opinion the Windows Phone 8 UX was easily the best thing Microsoft made since Windows 7, and it keeps being years ahead of Android because Google seemingly rejects any idea that would fix existing issues or reduce confusion.
