C# is one of the best languages I have ever coded in. For business and OO development it really is amazing. Microsoft hired some of the best language designers in the world specifically to build C#. If some of that power could be put into a script language, it could be incredibly useful. The obvious side-effect to this is that this stuff is all Microsoft specific, not Linux/Mac compatible, not really portable in any way, and not open source. You have to weigh up the pros and cons.
Jim