Well, I personally find that most of the time when DDs take damage, it's one of two situations: Either the boss used some AoE attack, or it's an event like Hamlet Defense or United We Stand, where there's so many enemies running around that the DDs have to tank shit. Also, when the issue is the DD routinely taking hate on a boss, sometimes it legitimately is an issue with the tank.
Not saying melee DDs never screw up, far from it. Just playing devils advocate here because I really feel 75% is a gross exaggeration.
