I have a mix class group when I do my IQD dailies.

Prot pally does not even bother with 1h/shield, and just use a 2H atm.
Arms warrior charges and spams Slam and MS.
Frost mage just spams Frostbolt and Icelance.
Holy/Disc just throws a Prayer of Mending and is lucky to hit with Smite before the mob dies.

Combat Mace rogue is useless, but gets in melee and just stuns the mobs to sillyness; but shares the same account as the
Holy Pally who is just there for Sanc aura and holy shocks.

If I were to redo, I'd make the rogues Sub for Shadowstep and easier time to position; but stun maces is a nice auto attack, low micro ability.

Priest is all I need to healing via PoM.
Holy Paladin is easier to micro heal since it's just spamming Holy Light (but no ae healing).

But I can't run a team without a mage. I love the food and taxi service too much.