I really like C#, and I would generally vastly prefer it to NodeJS on the backend. I think one weakness is the library ecosystem, the competitors are stronger there. Most of the time this doesn't bother me as I also tend towards limiting dependencies in general.

There is a positive aspect to this, as it makes decisions easier as well. For many areas there is often a single good choice, there aren't dozens of web frameworks you have to evaluate. There's ASP.NET Core and then nothing else for a long time. And for the most part those are pretty good, so it does not feel limiting.

And C# doesn't have to be too enterprisy and over-abstracted. The community does tend a bit too much towards unnecessary abstractions in my opinion, but you don't have to use it that way.