Potion!

[Thaliss]

They have their uses in my opinion.

Health : solo play mostly
Mana : always useful, additional flare as mentioned or long fights
Stat boost : the most underestimated potion. DPS race? pop a STR, DEX, INT (MND if cleric stance) mega potion. You know you will get a big nasty hit as a tank, pop a VIT potion, healers will top you then.
Status cures : these are situational.(works for an hydra fail and you get paralysis)
Attack potions : they have their uses, could even be a fail safe for example silencing potion for ADS

They are mostly situational, but I believe SE should separate the cooldown timers by category