If Linux were actually easily useable by the great unwashed masses, it would have eclipsed Windows a long time ago.
But when ya gotta tweak this, edit that, redesign your partition plan, select and configure a bootloader, select repositories, or configure anything in general, you immediately re-format and stick Windows back in there... Take your potshots, but we're talking about the great unwashed masses here.
Linux is just too fragmented to get their sh!te together, and these divisions, those territorially-defended fiefdoms that keep Linux nicely separated into a bunch of camps that will never join up to fight the war, will keep Linux in the losers' column for eternity as far as the average desktop is concerned.
Yes, at the rate Linux is succeeding on the desktop, both Microsoft and Apple will be allowed to continue their legally-sanctioned rip-offs worldwide forever. And the fact that Apple can continue to get away with tacking on their over-priced, sometimes defective proprietary hardware to each and every non-upgrade operating system sale, is in and of itself a testament to how bad some people find Microsoft products to be.
Even Google is trying to do something about this David and Goliath duopoly (who secretly are best friends), although we all know additional profit is at the end of their rainbow in reward for their 'generous' efforts to provide something that empires have been built on and huge fortunes made, for free. They must look at Linux in wonderment.
C'mon, if it's free and it still hasn't made meaningful headway ('meaningful headway' meaning likelihood it will become dominant in your lifetime) on the desktop, then it's gotta suck! For the average user, that is.
I install new versions of it all the time just to see how easily useable it's becoming.