
A standard military doctrine for small unit combat would basically dictate that you position your most heavily armored person at the fore while your 'flankers' sweep in form the sides to incapacitate your enemy while you keep an archer or "ranged" at the back to not only keep people from overwhelming your position but also to pick off exposed targets of opportunity. Of course in this case you can add in "the healer" but generally speaking it'd be like a diamond pattern with tank at the fore and "dps" at the side points ready to flank the target being engaged.Â
That way it's less to do with "hurr they're attacking the heavily armored guy first what a bunch of dumbasses" to a more realistic "they have to get through our heavy first and he's not likely to go down anytime soon".
That way it's less to do with "hurr they're attacking the heavily armored guy first what a bunch of dumbasses" to a more realistic "they have to get through our heavy first and he's not likely to go down anytime soon".