I think Windoze has Linux beat in terms of ease-of-use. (But I admit the only distro I know well is RH9).
Remember, ninety percent of PC users these days couldn't even tell you what an interrupt is. People want their PC's to work like their TV's and microwaves and cars. Simple and reliable.
So that is the biggest marketable edge that can be found. PNP type technology.
Download yourself a copy of Mepis 6 Beta3 from distrowatch.com and burn it to disk, you will be amazed. :) Mepis 6 distrubution release(final) will be out sometime in June.