Hangouts is a great example of another horrible UI. The whole tie in to Chrome made it unusable for anyone non technical (where did it go? What did you want me to click? I am in the call, but you're not there... oh you're in another call? How do you hangup? I don't see the window anymore, etc.)

A standalone app would fix this, but there seems to be some strange internal agenda tying it to Chrome... Chromebooks I guess?