The missle tries to think, therefore it fails because of its subjectivity
The projectile is mindless, therefore never fails due to its total objectivity.
I'm a gunner. I never rely only on them, but always use them as a primary means of dealing damage. Mines, a CD, a razor - those are weapons of secondary importance.
I also teach my guys, that fire support and numbers are the essence of modern warfare. If you don't have a buddy to rely on in combat or you yourself can't be relied upon - you're better off dead.