Hooked up a Western Digital external drive that I had used on previous Macs and launched Time Machine. And that's when it started. Time Machine presented what seemed like a stack of Finder windows in the middle, a timeline with hash marks on the right-side and the only button highlighted was the "Cancel".
No menu, no other actionable buttons, no right-click menu. Nothing. So after hitting various key combos and mouse buttons, I decided that my 30+ minutes trying to use Apple's built-in backup software to backup a few folders was better spent finding 3rd party software.
And that was another user experience fail in my opinion for Apple and any "total quality" experience.
And that's not even talking about Safari or XCode or Pages or Numbers or iBooks not syncing and so many others.