Living dead was garbage at the start and now it's even worse !
It's only useful if a White mage is ready to spell "benediction" (insta heal + full HP).
As you said, how can à healer can give you around 50 000 hp in 10sec ?
I have a macro :
p) Sole survivor on me, heal me to full hp if at 1 hp

Most of the time, it's a fail...