I just couldn't get past having different operators for floating point and integer arithmetic. So O'Caml never passed go, for me. Imagine a mathematical system in O'Caml with polynomials, matrices and many other mathematical objects that you want to multiply. It'd be a zoo. At least Scala allows operator overloading!
That is pretty ugly. Really as much as I like the current generation of FP languages I think we still have a ways to go before we have a serious contender for a mainstream language.
