Iran's missiles are certainly a threat. It is only the degree of the threat that is unknown. A war with Israel will give them plenty of practice at least. Did you know that during second week of the 2006 war the IDF tanks and infantry crossed the border into southern Lebanon and encountered Hizbollah face to face? After a fierce fire fight, the IDF sustained a few dozen casualties and withdrew back across the border, leaving a number of blazing tanks behind. Those Israeli troops never crossed back into Lebanon. The rest of the war was carried out by Israeli artillery and aircraft with a couple of special forces missions far behind the lines. The IDF was a dismal failure in the 2006 war. This is why Israel fired it's defense minister, it's chief of staff and seven other generals and this is why the Winograd Committee was formed. To find out what went wrong. Hizbollah's success in this war gave them substantail political gains which they have since consolidated. At this point, the IDF has become an over rated joke, good only for killing unarmed civilians. They certainly inspire disgust, but not fear.
Israeli soldier lightly wounded after being hit by car south of Hebron (Haaretz)
from the article: Barak: World must act against Iran before it's too late