Seconded. I love .NET, but I hate how MS's not-invented-here syndrome repeatedly (albeit unintendedly) kills great open source projects. (point in case: NDoc vs Sandcastle). Really hope this won't happen to Servicestack
For ye interested here's a glance of what 1 service class buys you in ServiceStack: https://gist.github.com/1787443
ServiceStack also boosts/modernizes and works seamlessly with MVC: http://www.servicestack.net/mvc-powerpack/
ServiceStack also includes the 2 fastest text serializers for .NET (JSON/JSV) - many factor of times faster than all of the JSON serializers in .NET: http://www.servicestack.net/benchmarks/
And if you add the ProtoBuf plugin you get .NET's fastest Binary serializer as well: https://github.com/ServiceStack/ServiceStack/wiki/Protobuf-f...