C# as backend under linux, is it worth it?

Question

C++ / C#

The task is to develop high-loaded backends for mobile games.
Our frontend is Unity3D. C#.
We use very different databases (nosql redis / mongo and sql - mysql / postgresql)
Now PHP is successfully coping with the backend, there is a great desire to start writing backend in C#.
We are familiar with the C# world only in the frontend through Unity3D - www.mono-project.com
We also know that a stable version has been released https://github.com/dotnet/corefx
Is it worth using C# on the server now? OS we consider ONLY linux

Answer 1

Should C# be used on the server now?

Certainly.

Answer 2

We also know that a stable version has been released https://github.com/dotnet/corefx

ASP.NET Core is also in the release already, if you need a web api.
Just make sure that there will be no problems with pairing with other systems. For example, check that the mongo client lib will work under .net core. Also with everything else. Well, or be prepared to participate in finishing the libraries.
What else does the current backend work with? AMQP, web sockets?

Answer 3

Look towards ServiceStack