How mature is ASP.NET MVC?

The first bits of ASP.NET MVC were introduced in October 2007, at the first ALT.NET Conference by Scott Guthrie, and it then took almost 2 year to reach the stability need for the first release. In total we can say that ASP.NET MVC is being used by the general public since almost 4 years: that’s a pretty long time.
I hope you found this little excursus useful and if you think I missed anything important, please don’t hesitate to add a comment.