Warforged is a weak tree for a melee. Or, more correctly, it's not a strong enough tree to make up for the inherent disadvantages of the class.
150% healing amp is the least I'll ever consider running with if I can't self heal well, and 200% is really the minimum it takes for me to be content. More is better. Hitting those targets on a warforged or bladeforged is extremely difficult, requiring major gear investment and maxed out Healer's Friend, along with probably paladin past lives and class enhancements. Doing it on a human is pretty easy. That alone means that I would never consider a warforged melee (or a bladeforged if Reconstruct is changed).