In general, overall tooling is not at the same level. Code gen is focused on a C#-like model, designers aren't there, debugging isn't the same (immediate window, for instance). Last i checked (which was a while ago), VS testing didn't work with F#. Even Intellisense is not as complete. I'm happy with F#, very happy indeed. But it lacks the resources that C# gets thrown at it. And it suffers from MS not having the honesty to just admit MSR outdid them again (as they did with generics), that as a language, F# simply outclasses C#. Instead, we get lines like "F# is for scientific computing" or similar spin.
So yes, shipping F# with VS is a good step, and technically it's supported, it's obvious MS has some discomfort there. Which is too bad, cause F# is a rare jewel, nothing else has the combination of language features, interop/library, performance, and tooling.