Paladins I find to be the best if played properly. I wont go into very much detail.
Paladin with correct buffs could spam sacrifice and heal more hp than they lose, Buff on cool down reduction and get prayer and you should be able to play as a bishop/Tank
I prefer to Use Health in the beginning, once my hp has dropped below the bonus from the health i will switch to focus, then Phoenix icon, and angelic Icon + ToL should give me close to full hp again. When the Angelic icon runs out and Phoenix Icon i would switch to a mage weapon w/ acumen when necessary. to heal myself. You're casting should be under .5 seconds and cooldown should be less than a second.
If you focus on your crit rate rather than how much you hit. You should be able to make up the lack of str you have if u -9 str. It's alot of damage reduced but with an insane amount of attack speed and crit rate/power you should be able to keep a steady HP decrease/increase.
You can also keep a party alive if you run around alot using sacrifice and mage weapon + mage armor. I've done this before and was able to keep my party alive until 18 people came at me. :) (2 bishops i dropped them so fast)