Q:
Zealous Blade scaling
A:
At lv 80 it heals 25 per second. I have 1676 healing power, and It still only heals me for 25.
Anbringehr-Human Guardian
My Build The Legendary Defender
The biggest advantage/use of zealous blade is that it heals for every target struck. So in a large cluster of mobs you can multiple that 25 heal by the number of enemies. The greatsword is one of our faster attacking weapons with good AE so this makes zealous blade, which on the surface look like a worthless heal, into a pretty significant self sustaining ability. Combine Zealous blade with Monks Focus and you have yourself a decent survival build with good damage.
Down side is that Altruistic Healing scales so well with a group that it outshines Zealous Blade and Monks Focus with the more allies you have around you. Zealous Blade reduces its effectiveness throughout the duration of the fight because you are killing things. Altruistic Healing stays consistent throughout the fight because your allies (hopefully) are still alive as you do damage, even if it is less damage.
So take your pick. Maybe solo go monks/zealous blade and maybe grouped do altruistic healing.