Actually done as a mini series, I just rewatched Arthur C Clarke's, Childhood's End. What a GREAT story. It has been my favorite sci fi story since I first read the book in high school. And they did a wonderful job making the mini series. I still love it!!! So good!
Well that's not actually a movie, it's a TV mini-series, and you titled this thread about movies. In any case, I saw it and thought it was crap. However the reason why is not because of the source material (the book was very good) but it just wasn't a story that lent itself to film. That's true about a lot of books that were written about ideas that don't translate well or at all into film. I saw the Apple TV series "Foundation" and it had absolutely zero (OK almost zero) to do with the book which was a book about ideas and has a lot of people talking. So to make a show out of it they had to totally throw out the book and make up their own story...which wasn't very good. For a show that Apple spent almost 'Rings of Power' money on, it got almost no viewers. I think I saw a number of about 10,000 views, so that was a disaster. But I can't imagine who thought that was a good idea to make a TV series out of a classic that's just not filmable