Long time after using LB3 time by time i actually thought that LB3 for healer was "ress all, and suicide yourself for that", until one time i was magically alive after casting it.

It still is however game changing in certain places, A4 particularly being the example where it can change everything.

Also as someone said about "timing LB3", you can't really "time" it as majority of people are dead and both tanks usually too when you have to cast it, so most aggro is towards you anyway