I pretty much agree, with one exception.
Blade Runner.
The directors cut was far far better than the initial release.
One writer, say a Hemmingway, or Azimov... that works.
Two or more? David Drake and Eric Flynt? Yeah, it's ok.... Some other couplings work better. Niven and Pournelle pop to mind.
But hand it off to a screenwriter and producer? Katy bar the door and hide the girls.
Imagine Ringworld as a movie. You do that. I gotta go barf.
/johnny
Having seen both, I must agree with your exception.
Voice-over narration is always dicey, and Harrison Ford's flatline monotone simply didn't cut it. The best voice-over narration I've ever heard in film was Goodfellas. Ray Liotta especially did a magnificent job.
That said, just watched director's cut of Bladerunner the other day, and the movie is not holding up well for me. Maybe I've watched it too many times, but the movies I really love, I can watch an infinite number of times.