It depends very much on the type and speed of missile you're intercepting. For short-range rockets, the technology is pretty solid (Israel's Iron Dome has an ex

It depends very much on the type and speed of missile you're intercepting. For short-range rockets, the technology is pretty solid (Israel's Iron Dome has an excellent track record). For battlefield weapons and cruise missiles, it's OK (the effectiveness of the Patriot anti-missile system is hotly debated, but it seems to have a success rate of "more than 10% and less than 80%"). For things like ICBMs, we're really not even close.