3v3 is definitely viable, but youve gotta get the first nuke off, ive played with a few diff combos and from what i have seen miss the nuke at the start and its almost impossible to recover, i played 3s with fire mage, ele shaman and disc priest, and about 75% of the time me and the mage got the nuke off and killed their first guy, leading to a win. hardest groups we had to fight were pally, pally, shaman, and rogue druid pally.