hey, fvwm with the right configuration is quite nice... It was my windows manager of choice before switching to os x 4 years ago (and I still miss it some times).

I used to run the gnome panel with it and found it much nicer than metacity+gnome...

But of course, fvwm is good only if well configured and I doubt they took the time to do that. And I do agree that most people will not see want to spend hours configuring it...