I have been using CloudScript for almost 2 years now. I developed a way to unit test my code using Node.js as a proxy for the server and I can debug that with Iron Node, which has saved a lot of time. But bugs still slip through and I have to go back to old school trial and error logging, which is laborious. I would like to be able to debug my CloudScript in place on the server.
There are requests for C# CloudScript, since people like to use languages they know, and many people likely develop in Unity, but with no debugger CloudScript development will remain slow even in their preferred language.