On my Cleric I'd be a little peeved if somebody showed up and needed healing at the start of the quest. Drink some potions for f sake. Same reason I get grumpy when people aren't at full health and refuse to shrine and then be healed later. Cleric sp is a very important resource IMO and should never be wasted.
I'd never show up at a quest with less than max or very near to max health on any of my toons, f, wiz, cl, barb.
It's just poor form IMO.
Even if you wand whip them, why are you wasting my wands instead of drinking your potions?