I went to the première with my parents to see that
Having just seen it I'd like to know something.
Were audiences back then convinced by the terrible effects?
As Roger mentions above, the rear-projection is awful and, by far the worst crime you can commit as a film-maker, the action scenes are speeded up to a stupidly obvious level. It always makes a film look rather "Benny Hill" as a 100 ton boat suddenly start sdoing 200knots and turning quicker than a house-fly.
Bond could have also considered some longer shorts but they weren't as bad as his powder-blue towelling "Baby-Grow" in Goldfinger.