Would Logan's Run qualify as a bad movie?

[AndyC]

The difference there is that Logan's Run was a genuine SF story, trying to explore certain "what ifs." Star Wars was a space opera - a generic action story (and I love it, believe me) dressed in SF wrappings.

The change is not so much in the kind of science fiction Hollywood has embraced, it more reflects the abandonment of the real thing, in favour of a model that is mostly action in a futuristic setting. More accessible to the masses.

What is special about the early 70s was it was a time when real SF stories could be made.