@rosborne979,
I didn't read
Jaws, and cannot, therefore, make the comparison. I've read
The Lord of the Rings ten or fifteen times in the 45 years since the firt time i picked the book up. I enjoyed the motion picture, because they handled the special effects so well--but i did not like how they butchered the story line, and i was particularly offended by their treatment of the character of Aragorn. In the novel, he was to me a rather pompous and stilted figure--but then, Tolkien was of the generation that grew up reading Rider Haggard and that genre of adolescent literature, and to his mind, Aragorn was probably a realistic rendering. But the way Aragorn was treated in the motion picture simply made no sense in the context of the plot, whether in the novel or as a motion picture. In fact, to my mind, the best part of the movies was the "director's cut" version of the battle scene before the walls of Minas Tirith, which was a magnificent tour de force of "SFX." So, not a bad movie, but a total butchering of the novel.
I would use
Catch 22 as the best example of this (did i already mention this?). That slim little novel packed a good deal of detail into a small space, but still too large to be literally transcribed to the silver screen. I thought they did an excellent job of editing the story without sacrificing characters or plot to produce the motion picture.
One of the reasons i really enjoy sci-fi movies is the special effects, but that's not all of it. Movies like the
Star Wars series bore me--the actinic explosions (you won't have that absent an atmosphere), the loud noises (same story), and the basic plot of a western left me unimpressed. For the same reason, i don't care much about the
Star Truck--movies. They can be amusing, because watching Bill Shatner "act" is like watching a slow motion train wreck. But i don't consider either series to be good sci-fi, despite the big SFX budgets. The hype for the movie
Alien in 1979 had a great tag line--"In space, no one can hear you scream." Now that's more like it. I enjoyed the first two Alien movies, but got bored with the last two, especially the finale.
2001, A Space Odyssey was one of the best, and it had fewer than 70 SFX scenes. What they did reproduce was extremely well-handled. When the boys were doing their EVAs, all you could hear was their breathing, which would be all you could hear if you were aboard monitoring them. That movie was good for another reason. It was based on Clarke's short story
The Sentinel, and in this case, the story was the point of departure for the movie. It avoided all the failings of movies made by butchering a novel.
Hollywood certainly has a bad record with screenplays. In the 1930s, they paid F. Scott Fitzgerald and William Faulkner a thousand dollars a week and more to write screen plays (incredible sums at the time), and yet neither of them wrote a screen play independently. Fitzgerald's only solo credit was adapting the Erich Maria Remarque novel
The Three Comrades for film, and Faulkner did not, i believe, produce a single independent screen play (i.e., he was always a "collaborator"). Hollywood doesn't care about the quality of a screen play, or its fidelity to an original novel, they just want to follow a proven formula to produce a big hit movie. Most Hollywood producers are trying to hit a home run all the time. When the studio system was in place, they probably actually produced more bad movies than they do today--but there was more of a market (no tee-vee), and many producers and directors were content to "hit a single," rather than always trying to "hit the home run." The quality of work done on an existing novel suffers as a result. I think the best movies Hollywood produces come from scripts written for the screen at the outset, and there are damned few of those which actually turn into good movies.
The biggest problem i have is that this reliance on formula has lead to so many sci-fi movies actually being westerns set in space.
Star Wars suffered from this, and
Outland fer chrissake, was
High Noon set in a Jovian mining station. One of my favorite sci-fi movies was
Silent Running. Although dated in terms of what we expect from SFX these days, it was quite novel at the time. The director had worked on the
2001 SFX. What was refreshing about it was the plot/screenplay were like a sci-fi pulp mag short story, or a short sci-fi novel. It didn't resemble a western, and it's one of the few sci-fi movies of which i know which was filmed from the screenplay, and was actually sci-fi, rather than a western or a swashbuckler disguised as sci-fi.
OK, OK, i'll quit now . . . but it is a subject about which i feel strongly.