Devotion aura if you ask me is quite shit atleast if you are a 10man guild doing HoF since Devotion aura is useless for most bosses in HoF.
For the 1st boss is devotion aura useless for everything, exept if a player gets MC'ed and acually uses spell dmg but even tho its close to useless since the dmg a player will do it not very high anyway.
For the 2nd boss is devotion aura acually useful for the last 20% which is actually where the damage is.
For the 3rd boss is devotion aura useless pritty much, it helps reducing damage from the pheromones but still the dmg from it is not very high.
For the 4th boss is devotion aura useless unless someone steps on a bomb but if they do you will probably not even be able to use it because i doubt someone will announce that they will make a mistake soon.
For the 5th boss is devotion aura useless unless someone fails on interrupting the monstrosity or themselves.
For the 6th boss is devotion aura only useful in the last phase which is helpful but still it's far from being as effective as other raid cd's
Imean if deovtion aura would get atleast a buff that made it reduce the physical dmg by 10% thats not that much it wont make it OP.
Really devotion aura is pritty underpowered right now since it's very few points to use it.
Compared to other healing cd's it feels quite weak.