It's probably been said somewhere else, but General and Moderate basically mean the same thing. If you want any of this to ever make sense to new users, pick some category names that more directly reflect the nature of the categories. Something like PG, Mature, and AdultOnly should work fine. I may be getting older, but I can still remember a grid where that worked out pretty well.
You are working hard to get there as rapidly as you can. Does this include actually hiring any additional Lindens to handle the problem? Or maybe rehire some of the good one that just got fired? How can your customers believe in your renewed interest in customer service when so many of the customer service people were thrown away?