> the thing I'm most excited about is pattern matching. Having used F# for a short time, that was the biggest stand-out feature; it really does make some code much more concise and expressive.

I'm all for C# getting more expressive, but what it calls "Pattern Matching" simply is not the same thing as real honest-to-goodness Pattern Matching.

C# "Pattern Matching" is little more than destructuring, or switch, on steroids.

Much like how the compiler assists you when writing subclasseses so that you've implemented all the required methods, real Pattern Matching (F#) gives you the same guarantees from the compiler that you've handled all the possible cases appropriately.

This makes real F# pattern matching much more useful than "switch with destructuring", and helps you grow your programs in a safe way.

The C# way has all the same problems as the switch statement, which gives no feedback about what cases you've handled.