Who told you Google had a reputation for good UIs? Every Google UI is atrocious. Gmail uses UI concepts that were tried and rejected by Microsoft back in 2000. (Drop-down menus that obscure less-used options under expandos.)

YouTube's ContentID UI deserves a special mention, it's not just awful, it's actively sabotaging people questioning ContentID strikes (90% of which are fraud.)

Or try the new Google Hangouts desktop "app". (Not really an app any longer-- now only the Chrome add-in is available.) It's hilariously awful. It's almost as if they're trying to sabotage their own product. Don't take my work for it, read literally any of the reviews on their own app site:

https://chrome.google.com/webstore/detail/google-hangouts/nc...

Sorry. I could rant about how terrible Google's UI/UX is for days.