All my users who sit at my managed Windows machines get their serious work done, with little to no trouble.
If the user - me - has the luxury of a professional computer wrangler to keep their Windows system running well, then maybe no problem.
Speaking as someone who must deal with a Windows machine running XP and Microsoft software without professional help at hand, I can tell you that I have trouble with it, and my '94 Mac is and has always been - from day one - much more trustworthy (as well as being about three times as fast for everything I do on both machines).
You can blame the user all you want - and every administrator I know does - but I am damn sick of having to learn how to delve into the machinery of this thing, and the details of the software, and so forth, just to get something to print right, or get rid of stuff I never asked for, or change back stuff I never asked it to change, or open a file, or send an email to a chosen address, or unfreeze the screen, or get an icon off the desktop without - for sure without - losing track of the application, or find all the pieces of some application that was making trouble to rid myself of it, or figure out why the machine was suddenly taking five times as long to perform ordinary tasks, or any of a dozen silly, stupid, mundane wastes of time I never - not from day one, not ever - had to deal with on the old Mac.
And if you are wondering why Windows users end up crowded with copies of mp3 players and the like, I'm not - it's not easy to keep that stuff off the machine, or uninstall things that have - for example - rooted themselves into the fucking registry with their own "update" and re-installation features cryptically labeled. I had to buy an aftermarket book, 300+pages thick, and pricey software, just for ordinary housekeeping.
Pah. The hard drive just kicked in again, for some reason - I'm just typing here, the machine has its own agenda. Noisy bastard, too - all that stuff for playing music etc, and a loud white noise generator at the center of it.