Think again.
Melee must step into mob face. HARRIED.
Caster 'boing, boing, jumpity jump, haste, HAHAHHAAHAHHA ' firewall, casts, blasts, HAHAHAHAH hastes, rage, LOOK CAN'T TOUCH ME' NOT HARRIED!
Notice the difference?
Now to make it FAIR lets do this. Lets make all mobs get +5/10/15/20 to saves(depending on level of alert), and give them 25/50/75/100% resist to all spell damage depending on alert level.
THERE YA GO, now u see what melee's have to face. if they did that, the DA system would be equally annoying/punishing to all(IE not fun.. DUH...)