We do have funsuckers in heavily quested zones right now. (Granted, this usually only happens after a new expansion or during holidays.) They spawn camp us on PvP servers. They steal our gathering nodes, even though they are in the same faction. (Stealing nodes from the opposite faction is fair play. We don't want to help them support their side of the battle.) They take their huge mounts and sit on NPCs everyone needs to interact with.
They suck our fun.