As a long time fan of Final Fantasy, I've always had a love for water based spells and techniques in the games. Shouldn't come as a surprise then that Leviathan is my favorite summon from the series, and am extremely excited for the Leviathan egi for the Summoner in the future.
What I'm more concerned about, at this point, is the lack of water abilities this game currently has to offer, and the only water spell that XIV has currently has very limited usefulness. Fluid Aura; why can't it be on the same level as other spells in the CNJ/WHM repertoire? It's best use is in soloing when an enemy gets too close so that it can be blasted backward. How often do tanks and DPS want you to use this in a dungeon? Pretty sure that answer is never.
My hope is that CNJ and WHM can receive a better water spell in a future update, maybe in the expansion or something. Or, an alternative, let a new class and/or job also take on the water line as well, possibly a Red Mage which could learn Water I and Water II instead of Fluid Aura. (And then maybe give Water II to CNJ!)