Depends on your playing style as each to ther own, if you like a more complex class then WAR or DRK but if you prefer to a simple class like PLD then I stick to it. You just got to think what do I enjoy doing more? I myself like to be that Tank that can take a hit and still survive and PLD dose that well if not the best of the Tank class's and that is why it has low damage out put but it dose relie on healers beining able to heal it something that a WAR and DRK can do.

But after HW came, PLD is a lot more survivable thanks to the fact it can cast protect which will have the full effect as a any Healers protect and same with it's Stone Skin, only difference is 1 sec cast time. The at LV52 PLD get's even more OP lol with a skill that will always block the next physical attack with it's shield.

In short there is a lot more to PLD then meets the eye. If you play it right you can be a very solid built tank.