I have seen my friend tank he plays in JP server and been traumatized by the bad client server latency and RED danger zones, every time he gets out of the red zone and stay
way far away from it he still get damage from it. poor healers have to suffer

AND MOST IMPORTANT THING is the STUNS , he was off tanking chimera and and assigned to stun dragon roar as soon as he saw the spell bar been cast he clicked on shield bash WHICH should have stunned the monster- canceled the casting- but it didnt the spell was casted and everyone blame him for not stunning soon kicked replaced after few tries, i dont know if that the case in US-EU servers but i have noticed:

Even PLD takes alot of damage EVEN when using his -dmg reduction spells on the big spells, i played ffxi and loved how PLD where the kings of magic mitigation and physical , i thought they would be the same in FFXIV:ARR but compared to FFXI PLDs they are crap.