Hmm, I've been using .NET since beta 1 in 2000. Maybe you had access to earlier bits? It was never just about webapps. In fact, Windows Forms was meant as a more sane MFC if anything.

Interop with native code was always very easy. From PInvoke to managed C++ there were a lot of ways to do it with ease. Things have changed but I still think this is one area where .NET has great support.