should i quit the game if...

[Ghasto]

im not using medica at all to be honest, i target invidually and use cure/cure2 depending on the needed heal size ... also if i see a hurt dps that doesnt get constant damage at the time i give him a quick regen and keep healing the tank to save precious time where i would need multiple cure spells for the dps

Well, sounds like how I'd do it, adding in that I usually only use Cure II with the Freecure proc and rarely spend MP casting it.
Sounds like you just need some reliable people with you then.