Theres a lot of negativity here that I won't comment on, though I'd be curious to hear where the author is coming from (what was the source of his/her experience with .NET). They may certainly know more than I do.
As for open source community, we have real data available so there's no need for debate: http://githut.info/
As of Q4 2014, C# was number 10 in langs by number of active repos, with 56k (compared to, say, 85k for C++). Came in ahead of ObjC, R, Go, and others.
It may not be JavaScript, but it's active. If you look at the other stats you'll see these really aren't dead repos either.
As for open source community, we have real data available so there's no need for debate: http://githut.info/
As of Q4 2014, C# was number 10 in langs by number of active repos, with 56k (compared to, say, 85k for C++). Came in ahead of ObjC, R, Go, and others.
It may not be JavaScript, but it's active. If you look at the other stats you'll see these really aren't dead repos either.