basing on emnity does not make sense either. there hasn't been an mmorpg that has made 1 pt of dmg = 1 pt of threat universally regardless of source probably since dark age of camelot. in this game, dots may generate extra threat. a dot with a debuff may generate bonus threat.

in addition, bards have - as far as i know - the only threat reducing ability in the game. don't know if it's cross class.

when talking about dps and overall damage you have to add a third variable here - the entire dungeon run, or per fight. per fight, dps = your total damage for that fight divided by length in seconds. for an overall dungeon run it can be hard if the game does not immediately drop you to an out-of-combat state when the target dies. this leads to extra seconds being added and for the overall damage done will make your dps seem lower than it should be. this is why - historically - the only dps that has ever mattered is the dps done during boss encounters, or on target dummies to establish a baseline.