Esuna spell - uses

[-DMR-]

From what I'm seeing, Esuna isn't useful enough in low level dungeons, is that right?

I'm currently leveling up the CNJ skill on the character, so I can be closer to getting the WHM job and a wider range of dungeons. By the way, can Esuna be used with ACN, SMN or SCH as well?

[Emurei]

From what I'm seeing, Esuna isn't useful enough in low level dungeons, is that right?

I'm currently leveling up the CNJ skill on the character, so I can be closer to getting the WHM job and a wider range of dungeons. By the way, can Esuna be used with ACN, SMN or SCH as well?

Correct, you can just cure yourself out of poison damage in the low levels, it's not till Brayflox last boss that the poison ticks get bad since it a stacking debuff(more stack more damage it ticks) and Esuna is a CNJ/WHM only skill. SCH get leeches which I believe isn't as handy because it requires LV40 and Eos out (though it cost no MP on your part)

[Garlyle]

From what I'm seeing, Esuna isn't useful enough in low level dungeons, is that right?

In some of them it really is. Toto-rak's damage can be a little overwhelming for new healers during the first and second bosses if you don't Esuna allies who get poisoned (except the tank, because boss AI will just repoison everything if you do). Most actually significant effects that need to be Esuna'd begin showing around level 30 dungeons onwards - Brayflox and Cutter's Cry in particular have bosses with attacks that don't just eat significant HP but also leave nasty DoTs that can be Esuna'd off.

CH get leeches which I believe isn't as handy because it requires LV40 and Eos out (though it cost no MP on your part)

While yes, it requires level 40, I'm pretty sure Leeches is neither tied to your pet choice nor free.