I don't think that's fair at all; F#'s integration with the .NET type system is one of its best features. I find that creating class types (and instances) in F

I don't think that's fair at all; F#'s integration with the .NET type system is one of its best features. I find that creating class types (and instances) in F# is usually easier than doing so in C#. And with object expressions, you can even program in an arguably purer object oriented style, declaring only interfaces but never concrete class types.