My "main" is a 17.7k health Pally who's sole purpose in PvP is to draw fire from people thinking "kill the brain". Works amazingly well a lot of the time. Chances are, if he dies, the others are soon to follow, so I just roll with it if it happens. Or rez him if the group finishes off whoever is left.

In PvE, he's the main tank as well, so yeah he goes down, they all go down.