That may be so but when selling software to large enterprises then .NET really helps. I think I would be safe in saying that most enterprises will have Windows OS somewhere in the data center. We've just built a product from the ground-up using MVC 4 (yes, beta) and it is just about to ship -- plenty of pre-orders already and the IT Police just let's us "in".

.NET is the only way I would personally want to go when targeting large enterprises with products.