For my self, I think that the basics mecanics of Living Dead is good. BUT, getting to 100% HP is really HARD on 4-people content (Should never happen, yes, but when you don't have the choice, you have to do it.)

I think, the healing needed must be nerfed, and not be 100% of the life. But something arround 70-75%, This make it really more manageable when you are not a WHM. Benediction is literraly used for Living dead and Superbolide. AStromancer get a really strong heal when you are low HP that can do a massive 70K crit, But still, something like 60-70K is missing when healing Undead. And Scholar, Do I really need to says something about them ? Come on... Their instant heal "shit button" is by far the weakest of them.

Getting down the healing needed for LD seems the better choice, since Benediction can overcome that anyway, but Scholar really have a Hard time with that.