My 19-year-old daughter bought herself a new computer without any of my input. She opted to go with an ASUS running Windows 8. The second she booted up her new machine, her first reaction was "This is not good." The Windows 8 tile interface felt like a toy (even using a touch screen). From that point on, her opinion was jaded, and she wound up returning the laptop.
Her previous laptop ran Ubuntu 13.10.
My point is that it only took her a few seconds to form an opinion about Windows 8. That opinion was based completely on how Windows 8 looked, and she couldn't get beyond it.
One glance at Ubuntu 14.04 (Figure A), and her first reaction was "Wow, that looks great!"