I rarely pug Clerics any more until the higher levels. My partner and I have hit 60+ on our Hard TR streak and it's been XPlicious. Then again, he takes care of himself, and I take care of myself.

TBH, I give one warning while low-level pugging. I tell them they need to slow down and/or contribute resources as I don't like Clericing where I am cleaning up other's messes.
Be nice but firm.

If they give you ****, that's what Word of Recall is for. Hit it, drop group, and go in and solo it.