The Man Who Fell to Earth (1976) may be our favorite Nicholas Roeg film, though the bar has been set pretty dang low. Even without David Bowie's performance -- and is he playing any more of a character than "David Bowie" ever was? -- this film deserves its cult status. Still as science fiction it fails for us on two major points:
1) The inventions don't seem that mind-blowing/paradigm shifting for 1976.
2) The departures from the source material eliminate the main anti-American militarism and anti-Nuclear weapons themes and replace them with...we're not entirely sure what this movie wants to say. Something about the alienation of pure genius?
Of course those are themes that show up a lot in science fiction, so I'll allow that Roeg may have been avoiding a cliche. But that doesn't forgive point one, which is a failure of imagination in production design (though it is probably the only aspect of this film that fails to be imaginative enough).