I agree there are ways to counter the stun locks, but on your whole team? keep in mind that its never one stat either (because of all the rest added in the combo) so its not that easy.
I have also seen that class attack like 3 or 4 times in the same round to the enemy with the least life, not even the front one.
I don't know if nerfing is the way, I think some of the other classes need some enhancing.

Cheers