I wouldn't call Tiamat a baby...Short of Special TP moves, like Proto-Ultima's various one-shotters, and Bahamut's flares, NO
tankable mob in the game can kill you quicker then Tiamat can with normal melee(past 20%). It's not something you can really expect and its not something that you can prepare for, short of stunning or sleeping. (How lame.
) Granted most of the time its SOO incredibly easy to bounce hate on her, and I can't count how many times she lands, doesnt hit a single person, only to fly again and shoot 30 damage fireballs, all making her seem much less then the monster we used to fight, but times have changed, strats have changed. I'd say the new CoP mobs are harder for NINs (Cerberus' near immunity to Elegy and attack speed, Bahamuts INSANE amount of AOE moves) are just more and more things to even the distance between NIN and PLD/WAR tanking or at least dampen the complete unbalancing Utsusemi has put on this games larger fights. When you have 4/6 members in tanking party able to pull hate and divvy up damage between the 4 of them, keeping TP moves and melee damage to near non-existant...you have to rework your HNMs to the point where that can't be done. I think Bahamut 2 and Cerberus have been a good step in that direction.