working as a team in a party

[kyuven]

Wrong.

Low level dungeon? Sure.
High level dungeon? Not so much.
Both tank classes have tools to pull a lot of hate very fast. If they're not using these tools, the group is dead.
There is ONE exception, and if there's a huge disparity in gear. A fresh 50 tank is never going to pull hate for longer than a few seconds off an FCOB black mage, for example. Unless they're in an iLevel sync'd dungeon, of course.