My group consists of 3 shammies, shadow priest and a warrior. I do have a macro on my shammies to heal Brann and put him on focus on my warrior. I try to tank the mobs as long as possible while I do have the rest of my teams spread out in the back and dpsing from there.When things get rough I fear them (first on my warrior, then on the priest).
When the crap really hits the fan I drop 3 fire elementals and spam heal Brann, which usually is enough to get through it (though not everyone makes it out alive).