Thats just bullshit. The Linux desktop maybe isn't broadly accepted or mainstream, but I dont see the Problem in that- after all Linux remains a system for power users, even if some Distros want to change that. And there really is no better desktop environment for those people than the Linux desktop. Windows is shit incarnated, so lets not even begin to talk about it. What remains? Mac OS. Sure, it has a more accessible GUI, but not a more efficient one. I cant think of something more elegant than a tiling wm, be it awesome, wmii or xmonad. Everything based on moving a cursor just feels awkward in comparison to the simplicity of ~5-10 keyboard shortcuts. And tiling also means that I always have everything in front of me. Fumbling around to find some window is HORROR.

I think the Linux desktop simply has more options for experienced users. I simply see no way how I could be more productive with a GUI designed to cater to lusers.