Supplemental groups = bad? (was: User Security Advice)

Rob Berendt wrote:

As much as I detest supplemental groups ...

What is it about groups that everyone dislikes so much?  AFAIK, the 
concept seems to work pretty well for Unix-type systems, and if I 
understand correctly systems like Active Directory and Novell Groupwise. I 
haven't had much experience administering large groups of users, so I'm 
interested to hear from those who have experience with various systems.

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