I can be quick to barf "Mary Sue" at many of the fic summaries I see at ff.net - but I agree it's becoming very popular to denounce practically all OCs as Mary Sues.

There's even a very famous Mary Sue. His name is Bond. James Bond.

Actually he's a Marty Stu (which I suspect you know). And Bond might be more famous, but Auel has sold more books than Fleming: Ayla is so my favorite Mary Sue, *g*!