To me, Dragonfire Dive is about equally limited as Burst in terms of usefulness. Being fire-elemental, it doesn't do much against monsters strong to that (cough Ifrit cough) but aside from that, damage isn't all the spectacular either. It's AoE - that's nice. It looks cool - aesthetic appeal. But I can do AoE with Ring of Talons, Leg Sweep, Doomspike....the first one actually seems to me to deal more damage than Dragonfire Dive. That's just my opinion though. Other DRG's may not think so.