Definition of Thumbs levels??

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I see from message #110 in this thread: http://www.tivocommunity.com/tivo-vb/showthread.php?t=465002&page=3
That there is a comment taken from the official VM form, presumably from someone from TiVo:

Is there an official definition or description between the 7 different levels of thumbs up/down anywhere?
My understanding on the S1 machines was that the 3 thumbs down option should be used with care as TiVo would never record a program containing a subject or category that has been set to 3 thumbs down.
Is this still the case?