Yeah... I just know that some different groups have different ideas of what constitutes autoconfirmed-ness (like at Wikipedia (yes, I know that's not Wikia), en is the 4 days, 10 edits, but Spanish is 50 whole edits which apparently had some sort of consensus there)).
And I also didn't mean hierarchy in the quality sense (besides levels of trust afforded to people who are given tools that have potential to break the wiki). I meant like IPs have less userrights in what they are allowed by the site to do than new users, new users have less userrights than autoconfirmed, and past that other groups provide differing rights (rollback, sysop, crat, bot, etc.). I put staff after everything because, without looking, I figure they have the most (if not all of the) rights. It's a hierarchy of the functionality of the account, not the quality of the user. I know amazing users who have never signed up for accounts, and I know of admins who have had their admin group revoked and been blocked for misusing admin tools.