this is exactly what happened with Candor. Candor had unavoidable on his primary skill. he would come out of hidden and knock everyone down and dealing damage. then the players complained because they didnt have Candor and cant beat him. so Dev removes the unavoidable from Candor skill and gave it to Odium.
this comes from the Devs changing hero mechanics and creating instability in the game play.
Atleast with Candor, you can still interrupt his primary skill. timing is everything. with Odium, its not as simple.