The fact that the system has only knocked out half of incoming missiles from a relatively unsophisticated adversary I would suggest it isn't anything to crow about. Iran has far superior technology and launching capabilities than Hamas. Hezbollah is more sophisticated than Hamas. What the current situation has highlighted is the system cannot cope with a mild saturation attack. If Israel has plans to attack Iran I would suggest you seriously beef up your missile defense.
Japan suspends work on U.S. base on Okinawa as Abe battles low ratings (Reuters)
from the article: A look at Israel's 'Iron Dome' missile defense