Part of it is about Ubuntu Users too

I'm sure there are some Windows to Ubuntu users like the people you talk about, and every day
some of them give up on Ubuntu.  However, most of the people I see on the Ubuntu forums are
making a real effort to learn Ubuntu as they encounter and fix problems.  

Some of these former Windows users then write up what they've learnt as HOWTOs on the forums -
while I'd prefer a wiki like Gentoo's (the Ubuntu one is not as up to date), the forum HOWTOs
really are an example of open source in action, and incredibly useful.  

Overall, the huge influx of Windows users to Ubuntu is a good thing - it ensures that there's
a real focus on usability.  And being able to run a few programs from Windows is very useful
for all sorts of people, including businesses migrating to Linux - if you use Virtualbox or
VMware you won't have many problems, though WINE is often harder to get working.