Your PLD must have sucked, honestly. Because you used Ifrit as an example so will I. We run PLD WHM 6xDPS and never have a problem. PLD takes less damage from magic than WAR and can heal themselves very easily, meaning the WHM doesn't have to do much more than keep regen up and drop a cure occasionally. People have it in their minds that PLD still sucks because of how hey were released. They are not. They are very strong additions to the team and honestly tank Ifrit/Moogle better than WAR. Hell, PLD still makes better hate than WAR in a long fight but people don't know how to wait 10 seconds for them to get the first block.