I would probably list a faceoff win under defensive responsibility, Offensive abilility and special teams utility. You gain control of the puck for your team and put the other team on the defensive rather than having your team chasing. Your team has possession and that puts the other team in a position of potentially taking a penalty while trying to regain control of the puck. I understand the other side of the debate as well but Find it hard to downplay a faceoffs importance in relation to all the other aspects listed.