It's not hard at all. Your dps is undergeared or your healer can't handle the damage put out yet. Destroy the medic, keep her interrupted, destroy shield dude, nuke him. But stop complaining about "OMG ITS TOO HARD CAUSE I CAN'T DO IT" because I assure you, there's a TON of people that can. Get more gear, or bang your heads against the wall until it falls over. All of this will be trivial in a week or two with more gear.