Yup, should have said "Salerno" because they were quite effective then (BB Warspite, BB Italia and CL Uganda were heavily damaged, BB Roma sunk, the Italian BB's not exactly at Salerno, of course) - at least somewhat more effective than the silly Japanese Kamikaze stuff . At least a nuisance in 1943... (nothing that the Germans did in 1944 was eventually strategically significant because they had already lost the war by then!).
They were a bit like chemical weapons - you get a bit of an effect when you first use them - but not much later. These weapons were almost useless - much LESS dangerous than Kamakazies - because we would jam their radio links. The problem of a kamakaze has never been solved - and would still work today - even if they flew commerical aircraft.
It is a deep dark secret of USN AAW that we really have a problem which was never solved. A related deep dary USN AAW secret is that we never did solve the problem the Germans had in reverse - OUR missiles can be defeated by jamming OUR command links too. We did once have a program to address that (it was called Typhoon) - but we never did implement it. Not having faced a technically sophisticated enemy in combat, we look a lot more capable than we really are. [As I said, it is a deep dark secret, not often admitted in general discourse].
Anyway - the kamakaze problem is a big one - and so was potentially a missile that guided itself on AA shell explosions! [It worked - but was not operational in time - imagine - the more you shoot the more you guide it at you!]