The tree is pretty much worthless. I've tried every variation I can think of, and it all comes down to the fact that your shields just don't stop much. This includes Pain Suppression. Its become the "suicide heals" tree. You get one shot to save a players life, and then die yourself, negating any advantage gained.
Holy lives way longer, and can actually keep other people alive for longer than 3 globals. Guardian Spirit kicks the crap out of anything in the Disc tree. The problem is you run out of mana in about 30 seconds.
You can heal almost as well in Shadow as in Disc, have almost equal damage mitigation in Psychic Horror, BETTER self survivability, and mana regeneration with Vamp Embrace/Veiled Shadows/Dispersion.
So what exactly is the Discipline tree for now? Does it have some kind of PVE application that I'm missing? Why would you skip out on Circle of Healing for anything in that tree?
Somebody enlighten me.