As pantheon, Level 11 is not a massive spike like other Supports. It gives only a measly increase in the damage and no utility, unlike other Supports. That being said, the lower cooldown certainly helps.

His first ability will be maxed out at level 9. This means he can deal a massive amount of burst damage to any enemy he gets too close to.

Pantheon is quite potent during the mid-game. This is because he can dish out a lot of damage in a short time and can secure picks all around the map.         As pantheon, Level 11 is not a massive peak like other Supports. It only gives a slight increase in damage and no utility, unlike other Supports. That being said, the lower cooling certainly helps. Its first capacity will be maximized to level 9. This means that it can inflict a massive amount of burst damage to any enemy it gets too close. Pantheon is quite powerful during the middle of the game.