Well, .NET Core is probably still 1-1.5 years away from being fully production "friendly". Common Open Source .NET libraries have to be ported, .NET Core itself needs to reach base class library parity at least as far as its scope is concerned (including things such as System.Drawing based on Skia# or similar), the tooling around it needs to mature.

Anything outside of ASP.NET Core or small command-line tools is probably premature in 2016.