While I agree with your point I don't agree that open source is overrated. This movement is one of the greatest developments in modern history, and the fact that corporations have exploited it for their own gain should in no way diminish its significance.
Open Source is the company takeover of the good that Free Software represents, I don't really see it as a "movement" by people. It's set up precisely to exploit the people for free labor and look good doing it.