I think I'm gonna stay away from it... for this game, at least. Whin doesn't need healing. (I hope)
PS.. pair with Viscious to completely negate the downside! (Viscious =+2d6 damage, but you take 1d6. With Wrathful healing, the avg from the 2d6 you deal/2 = avg of 1d6 you deal self, then heal self.
MIC had a vampiric weapon enhancement that's a +2, and only gives 1d6 healing when you hit, and I was very tempted to use it.
EDIT: From now on my high-lvl melee fighters will be wielding +1 Vampiric Viscious Speed GreatSword of Wrathful Healing. 5d6+1.5Xstr damage + 1, deal self 1d6, heal 1d6+half damage dealt.
With a 30 str and weapon spec, that's.... avg of deal 36 damage, take 3 damage, and heal 21 damage.. So total you deal 35 damage and heal 18... on avg.