Elemental is quite viable at least in MC.
Mana is not an issue when all fights are under 2 minutes (some under 1), just need to bring em' mana-consumables.
You wont be topping charts, but you wont be dead-last either and can actually do very well on the bosses where you can abuse CL (Lucifron, Gehennas and Sulfuron).
Resistances are not really an issue apart from Garr having slightly higher NR.