For mage, for me its a big No.
Mage is slow, stunnable and paper vs multiple classes
For sorc, he's strong vs critters due to his HH debuff, any team rellying on crit to kill a sorc without resistance debuff will struggle alot.
Sorc will die on the same way a elem die, stun it, and stack resist or SB debuff on it.
For Narco, I agree it can be frustrating to play against, could maybe have its success reduce, but that wouldnt change its use. It would still be able to stun a whole group of player.
If you play with a team its easy countered, only in Ancient where its without party that it might struggle, but on selfbuff sorc will struggle alot vs multiple ennemys.
People dont play alot of class that can be stunned, its to easy to counter them with it.