[roebk]

Pattern matching was recently added to C#. I can't say quite how well it's been embedded into the language. I always hear great things about F#, ADTs, pattern matching, nice type system and it integrates nicely into the rest of the .NET ecosystem.

[physPop]

F# is great. Simple, small, straightforward, great interop with .NET

[spion]

Also, the requirement to manually order the compilation units (files) in an XML file to ensure the compiler doesn't get confused.

They had me at features, lost me at manual compilation ordering.