One of things that also helps, but most RPers are loathe to do, is to level up so everything in an area is grey. Then you don't have to worry about mobs and can ICly ignore them. Generally, +10 levels over an area is sufficient.
Favorite Dev Quote from 2009: Graal: The lack of an instant threat catch up skill is one of the differences in tanking between Wardens and Guardians, just like Wardens dont have a easily used forced taunt. It is unlikely, but not impossible that this will change. Bottom line...Dont die.