I think you have to be relevant in the first place to be overrated.
From a home end user perspective it isn't relevant at all. As I said in another thread, if you feel it is and want to spout your drivel, then by all means I urge you to put up or shut up. Abandon Windows entirely and rely solely on Linux for all your computing needs.
From a commercial and technical perspective it is essential. Take VMWare VSphere for example. In today's IT world if you aren't using VSphere you are simply not leveraging your infrastructure efficiently at all.
That's only 1 item and it plays a major role. There are numerous others out there.