I find it interesting that bringing up .NET on HN manages to occasionally evoke incredibly poor quality replies like yours in a way that does not happen on Reddit. In fact, it seems to have better quality discourse which keeps surprising me. But if cheap jabs is what you're after - keep commenting.
HN has always hated anything out of Redmond, both justified and not. There's good reasons for it, the halloween documents and the EEE era are not easily forgotten so I sympathize somewhat, but not all corps are treated equally here. Google and Apple will regularly get a pass for doing the same stuff Microsoft did or does.
Outside of the SV bubble .NET will continue to be one of the most productive platforms to work within, and is continuing to grow in market share. Hardly a failure.
That being said, I do see the meaning behind where OP is coming from. There is a certain, shall we say, enterprise, culture around .NET (much like Java) that hasn't caught up yet, or hasn't fully embraced the new world of open source from Microsoft.
HN is mostly formed by the UNIX culture that you get at many startups since the turn of century, hence why.
If anything is a good reflection of what I keep referring to you about the Microsoft image outside the traditional Microsoft shops, that posts from .NET team on social networks about how much performance is possible nowadays with .NET won't change.
Working on a polyglot agency with lots of such clients, I get to handle this problem on routinely basis.
And why another approach to market .NET is required instead of boasting about TechEmpower results.