It's worth noting that there are popular Mono applications shipped with most distributions by default (Banshee, Beagle, F-Spot, and Tomboy are all C# apps running on Mono using GTK# for their UI). That would seem to indicate that Mono isn't univerally hated
by the F/OSS community, either.
Yeah, it's kind of funny. I think Linux uses more .NET on the desktop then Windows does.