I personally like Fluid Aura. But I hate it when it's misused. I use FA when I need to push annoying mobs like Sipaka (Sitaka? the monkey) in Hullbreaker Isle. When we do big pulls, the monkey always lingers behind because it's ranged. I usually wait till tank stops running and push it into the group of mobs, then run in to Holy. I also use FA against bosses/monsters that are immune to knockback.
But yeah... I seriously hate WHMs who keep spamming medica 2. Medica 2 -> cure 3 lol. Or medica when everyone's hp is at 95%. xD