Pallys, knights can over heal, i agree with this.
but compare them with the sorcerer/druids, at level 300 its pretty hard to kill a mage.. with his strong haste+time ring its almost impossible to catch them too. Also the dammage mages can dish out is "ownage". I hit like 300-400 mas san PVP, mages can hit that with flam hur/frigo hur for LESS mana. Knights/pallys cant dish out as much dammage as a mage, but still. thats why their healing is abnormally better, and a mage can heal very well too.
take Dark Legon for example...
he can outrun almost anyone on this server.. his healing is really good too. so in my eyes the server is over powered on teh mage side, thats why pallys/knights were made like "tanks" in this ot..
Just my opinion ^^.
Edit: Mage ue combos, can own almost anyone, keep that in mind also.