I don’t know OCaml, but to the degree that it’s like F#, then it is the case that while it is not easy (at first), it is very simple. I can almost always understand any piece of ML code within a few passes, but that has a vanishingly low chance of happening with C# or VB, both of which I know extremely well.
N.B. I am using Rich Hickey’s definition of “simple” from his excellent talk “Simple Made Easy”.