For instance Redundant is a moderation that doesn't make any sense to me because usually at the time it was written it wasn't redundant at all.
Other things are the trolls that mod themselves up with ghost accounts. Slashdot can't see that a bunch of accounts are all coming from a home DSL IP? I'm sure a few of those such things are multiple people on a corporate connection but most of the time I'm betting not.
And then there's the whole "I don't like your opinion so I'm moderating you down." Grow up people.