I have 20 years programming experience and C# is one of my favorite languages. It feels so expressive and doesn't get in your way nearly as much as Java does. I feel like I'm writing the code I want to write instead of writing the code someone from 30 years ago with a fetish for boilerplate wanted me to write.

Microsoft Java is one of those cases where MS got the "extend" phase so well executed that they didn't even need to finish the plan.

That said, the language is only good if you insist on using either it or Java. And the ecosystem around it is really, really bad.

C# is a great language but I'll always choose Java because the ecosystem around it is so vast. Often times some client library you need has a c# port maintained by one guy and he hasn't updated in years.