There are several factors which determine if those Iranian missiles are effective military weapons. They include:
1. Reliability – If a substancial portion of the missiles fail to reach the target area, then you’re going to need to launch a lot of them.
2. Accuracy – what is the circular error probable (CEP) for those missiles, meters or kilometers? Simply hitting somewhere in the general neighborhood of Israel isn’t enough to do any serious damage except by chance.
3. Warhead type – as the missiles become more accurate, the need for powerful warheads decreases. If the CEP is a few meters, then a conventional warhead can destroy a lot of targets (at great expense). If the CEP is high, then you need a WMD to do any serious damage. As of yet, it doesn’t appear Iran has a WMD warhead for those missiles.
There’s also the fact that Israel has both the Patriot and Arrow ABMs that stand a reasonable chance of shooting down many of the missiles that happen to make it that far. Quite likely, the counter-strike (accurate, reliable and most likely WMD tipped) would be on its way before the smoke from the ABMs cleared.
