[daigoba66]

The only decent argument against anything in the Microsoft stack, in my opinion, is the licensing costs. You pretty much need to develop on Windows using Visual Studio. And for ASP.NET you pretty much need to deploy to IIS on Windows Server. Though at scale the OS and MSDN licensing costs can be just a drop in the bucket. That is until you decide to use SQL Server on the backend. It's a great product but the licensing costs can make you go broke. If I started a new product or company and used .NET and needed an relational database I would seriously consider PostgreSQL.

[hhandoko]

It's a good thing that we can use ORM libraries to implement different database backends ;)

In all seriousness, it really depends on a lot of things. We've pretty much crossed Oracle from the list because it's just way too expensive, but it's mainly the availability of experts and the ecosystem around SQL Server that makes it an 'easy' choice for most shops in my area.