[NickMPK]

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WTF at this only being the 4th rated Sopranos episode ever. How is that even possible?

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This is mostly an artifact of how ratings are calculted. The top two "rated" Sopranos episodes aired in 2002 or 2003. Back then, Nielsen counted all HBO channels as a single channel, so anyone who happened to be watching HBO2 or HBO Family or whatever at that time was counted as watching the Sopranos. As of 2004, this is no longer true.
Additionally, this episode was also available "On Demand", and alot more people have TiVo now than they did in 2002, and watching in these ways won't count in the ratings. Although if there was ever an episode that most people watched live, this would be it.