It's not 0 because there have been relatively few failures on the military front, all the failures are strategic in the sense that the operation was never wise in the first place, but the soldiers fighting it have acquitted themselves decently well. A textbook example of how winning battles doesn't win the war. That being said, winning battles and losing the war is probably better than losing battles and the war. So I say 2.

Absolute success would require executing the last of the Ayatollahs resulting in the people of Iran being freed from the regime, that said it is actually delusional that people think there is 0% success on mission objectives in Iran, because obviously there is and Iran's terror infrastructure and weapons systems are toast