[EnderMB]

I imagine that 99% of the users on here won't work on any projects that receive the same levels of traffic that Stack Overflow will get, and as such the worries of scaling to this level aren't really an issue.

For the vast majority of websites that developers will build, the .NET stack is absolutely fine. My only gripe with being a .NET developer is that if your professional experience is limited to a Windows based stack you may find it hard to move over to a Unix-based stack.