I agree with @Okech. The problem seems to be that guys are comparing User-friendliness with pretty graphics and all. People forget that in the times of "DOS screens" the systems were perfectly useable and probably more efficient. I doubt if any proficient Linux / UNIX system administrator or power user ever has a need to switch to the GUI for whatever reason including listening to audio files, videos, browsing and reading pdfs and they work pretty comfortably. 

Some studies done revealed that usability mostly and to some extent entirely depends on what you get accustomed to first. If someone was introduced to computers first from a box running Gnome or KDE or even fluxbox, the time you move them over to Windows 7 / 8 or Mac they will most likely complain and take some time to acclimatize. The reverse is true. 

The current problems being faced by the desktop environments and window managers in the UNIX world is that they seem to be copying the Macintosh (and Windows) user interfaces but they leave out the most sensible defaults (present in Macs). Gnome 3 users can tell you more. 

Martin.