For the most part I think it is useless.

BUT, I think it is a great spell to throw up at the same times as a SCH would throw up their shield, and I don't mean with a SCH. I mean the same time you would if you were a SCH. Basically do it when a big attack is coming and have party stand inside. It seems like it would be nice to use during large mobs such as the rush of mobs in that one room with the node in center in the Aetherochemical Research Facility dungeon as one example, assuming you are in Diurnal Sect and have Aspected Helios up on the party, but I have not been brave enough to test it in those situations due to the amount of incoming damage. So Gravity ends up being a better spell to use.