I wouldn't compare it to ToC as much as I would ToGC.
I think ICC only really is hard on few fights: LK, sindragosa, professor put.
Problem is the learning curve all the stuff in game is easy, some ppl refuse to pay attention and learn thus always failing, but all people need to learn the fight before it becomes routine.
Both are easy fights need to be less about habituating them and more about "in the moment" skill.