Yeah, but it's pretty pointless without DRM because that's the only reason anyone publishes content in Silverlight anyway. Plus, while there's a version 4 beta, the last stable version is 2, and MS is already on 5. So, it's just easier to say that it doesn't work.
Couldn't you run Netflix with a Windows VM on Linux? Or would that not perform well enough?
Apparently you can. But IMO a cheap Roku would be a better option, because you don't need a keyboard and mouse. Or any of a number of cheap BR players that can do Netflix, Amazon, Youtube, etc. I always try to avoid use of a browser for a Myth install used on an HDTV.