I built one two weeks ago which has Windows (and Linux) on it, because one of its main purposes is gaming and I've had enough arsing around with Wine in the past. I sympathise that it's a pretty hard problem they're trying to solve, but I've always had cases where I'd have to resort to Windows and I'm sure I would again.

Also, I have PCSX2 on there. While it's allegedly cross-platform, the last time I tried the Linux version it seemed a long way behind the Windows one, let alone how tricky it was getting the thing to build in a 64-bit Linux environment to begin with.