Originally Posted by
blackblade
It's great on fights with a lot of adds and a lot of stacking. Sha, Galakras.
For MW, Chi Wave might be better if you're not good at positioning yourself and timing it to counter spikey damage, or Zen Sphere on fights where you're stacked and people are frequently dropping below 35% HP.
Ideally you'd use burst in fights with large, predictable spikes, and you're guaranteed to be stacked. Sha is best example this tier. You drop burst right as he hits your raid with his explosion, and basically clean up all the damage taken that wasn't absorbed by your disc priest.