Idk what party set up you have be with. But so far I know 1melee/tank+4range vs 4melee/tank+1range didn't have much trouble to win or actually I pref 4 range with me more XD. Since most of tank(pld,war,gnb)/melee(rpr,mnk,sam) damage is slow build and need to get close first. So is easy to counter with CC which is already high chance to kill off 1-2player right away once.