A year ago I would have agreed that Ubuntu was poised to take up the slack that a lackluster Windows 8 launch would create. Now they just come off as another vendor trying to copy the success of the iPad. As a person who used Ubuntu as his primary desktop for development, I've had to move to another distro (Lubuntu) because Unity/Gnome 3 actively enrages me. I'm not saying that to be dramatic, either. Every time I've tried to use that thing I feel like I have to wash it off my hands. I realize that this might not be as big of a deal to a completely new computer user, but how many of those are really left?
As an aside (and I don't mean this to start a flamewar) Gimp is not a suitable replacement for Photoshop. Gimp has all the same functions as photoshop (and some more, in fact) but that user interface is so bad that it's not really a viable replacement. Sure, there are plenty of people who disagree with me, but I think you'll find most of them are engineers and not people who work with images for a living.
If you don't believe me, look at what happens when Adobe itself makes the slightest change to any of its products. Its user base is immediately infuriated and threatens to revolt.
EDIT: Fixed typo.
I've never seen the point in making things overly complicated. Changing things from release to release is complicated, but it's better than sticking with tired metaphors that made sense in 1995 but not today. Might I suggest this rage Unity/Gnome3 makes you feel might be because it's radically different, rather than because it's radically worse?
I'll give you that the way Gnome 2 was set up by default in Ubuntu was pretty annoying. I also spent some time "moving in" after a fresh install. I did, however, find that I could get it just the way I wanted it before too long, something I've been unable to do with Unity.
Here's the thing: Ubuntu's primary user base (to this point) is PC users. I'm all for a bright future where Ubuntu runs on phones and tablets and toasters, but seriously, where are they? What problem does Unity solve for PC users that a more "traditional" desktop metaphor doesn't? I can't get past the fact that it's obtuse and annoying solely for the sake of novelty.
To each their own, though. The magic of Linux is that there are plenty of options. Windows users, sadly, don't have that luxury, which is what the original article was pointing out.
I will give you that Unity suffers from a lack of customization (I'm willing to give Canonical the benefit of the doubt that it's still a WIP). Unity/Gnome3 is exactly what I've been trying to customize Gnome2 to be like for the past 6 years.
There are so many open source options that I don't think it's worth jumping through the hoops microsoft lays out anymore. Office tools aren't windows specific anymore because of software like Google docs and libreOffice. Gimp has all of the features of photoshop although a little less intuitive. Qt creator is an excellent replacement for visual studio for c++ developers. Unix command lines make life so much easier. For the average user that only browses the internet and uses microsoft office I really don't think there is a reason to stick to windows other than for autodesk and adobe applications. Thousands of dollars can be saved by people if they just switched to linux.