i've seen a poll somewhere here. Around 60% of players think that something NEEDS to be changed. With minor or major tweaks.So...
I suggest to buff vitality and make a single CC-shield bar with no RNG which will decrease simultaneously with damage to vitality at some %. Add some spells\skills that will burn that CC-shield directly with no damage to vitality.
This would let you decide - try to kill fast with no CC or try to CC enemy. There still would be a CC protection as it is now but would let lone mages do not feel that some of them are worthless in party of 3 physical DD.