I first saw this as a child living in East London. The scars of Hitlers Luftwaffe were all too evident and the landscape of the movie was reminiscent of our street. I remember having nightmares after seeing it. The odd thing is, it really hasn't dated if viewed as a piece of social history in Cinema fiction.
Apart from a globally destructive war, the scale of the machines was badly awry, more Nano-Technology now, but overall, an excellent and well-crafted work. It was interesting to see how space travel was perceived back then. I would think that firing a spacecraft from a gigantic gun would almost certainly kill the astronauts. However, much was right. Mans desire for war, mans inhumanity to man. The means of war as a catalyst for development.