If possible, kill the ones with the big axes first. (Cant remember the name, destroyers?) One pull you cant do that tho. The beastmaster pull you need to put down the beastmaster first, it's a hard pull that. Other then that, at the groups with the priest around the lotsa hp guys, spam grounding totems and nuke bigtime. With grounding totems you can save caster mobs till last really, killing the melee mobs and having grounding deal with caster mobs will put a lot less stress on your paladin. Anything that hurts your paladin the most, prioritize those to die first.