I beg to differ: http://i.imgur.com/Ulzz5.jpg?1
500k damage / 300k protection / 0 deaths. If that's not being "useful" as a tank in PvP, then I don't know what is.
I love when people post screens like this. Without fail everytime there is usually 2, sometimes more, healers on at least one of the teams that has 700k healing. Congratulations on your game where the healers were allowed to stand there and free cast through your damage. Practically nobody died in this match.