I badly want to give this film a 3/10, because it is by today's standards, abysmal. However, you have to try and take this film for what it is, made way back in 1964, the world was a very different place, the height of the cold war.
It is a Christmas film, and it's of course intended for adults, so you probably would have had to have been there, it's sweet, and from a kid's perspective probably did have some degree of charm.
The music is shocking, and the acting.... I'll leave that for you. At least they opted not to make Santa a Kung Fu Master, it's all meant to be heart warming.
Could I sit through it again? Absolutely not, but one of the worst movies of all time? I've seen worse.