For Iran the mission could be considered successful. The drones shot down were used as pawns because they caused Israel’s radar array to light up and reveal their location. If there’s a follow up attack Iran now has those targets set.
Also 4-5 of the ballistic missiles were able to bypass Iron Dome and hit one of the most heavily defensed airports. Basically Iran demonstrated that its latest generation of missiles can hit anywhere in Israel with high accuracy.
It showed also that Israel’s defense is vital. And that Iran’s nuclear is now openly..genocidal.