For a multiparadigm langauge, C# 3.5 and up offer some solid functional programming stuff. Obviously if you want to go hardcore into FP you can find it in F#, but if you just want to do lots of awesome things with lambdas using otherwise-conventional OOP, C# is surprisingly well-equipped.

A lot of C# developers are stuck treating it as Microsoft Java, which it hasn't been for several years.

To me, the biggest problem with C# is cultural. C#'s user-community is entirely enterprisy... it's open-source adoption has been minimal, and that means that most C# code is still heavily stuck in a "cathedral" mentality where coders either use exclusively Microsoft libs (which are often terrible - no single company can ever be expected to get it right every time) plus some heavy wheel-reinventing, or maybe they pick up some gigantic vendor-backed 3rd-party lib like Telerik. There isn't the massive community of open-source developers like you see on other platforms.

Hundreds of languages? I don't know, Xamarin's tools seem to indicate that there's a real demand for using C# on a variety of platforms. While not my personal preference, C# is really a wonderfully well-designed language.