you have to remember though, Paladins are able to cure naturally, its job description in every fantasy game I've ever seen. Is a tank able to heal, YES; should it be as well as a healer (Only in wow.) However, they SHOULD be able to heal better then they do;
even leveling, PLD should be boss at solo/duo content... they should be able to keep themselves and a dps alive with minimul fuss unless they pull stupidly. as it is, PLD who use it see small useless cures that take 5-8 cures to top someone off (ie not under 50% health) if no healer is present/dc/afk/whathaveyou it should be 5-8 cures from 10% life, factoring in crits.
sorry about the ramble, its just a broken ability for paladins and it bugs me a lot.