I've just joined this website and I saw the pictures for ff4, are all the 3d graphics from the GBA version, ive got the PS version. I've only found the shitty beginning clip on mine.
The cg movies are only in the PS version. Nintendo scraped them for the GBA port, which in my opinion was a good idea because the already less then stellar movies would have looked even worse on a gameboy. Plus, they really didn't do anything for the story, as it's just a montage of scenes throughout the game. FFVI's opening was effective because it took you before the game originally began and lets you in on where Terra/Kefka were before it all started.
As someone who's introduction into the FF series was with Final Fantasy IV, I got a big kick out of seeing the intro graphics, because it was cool to see how Square envisioned their world and characters. That said, I agree it didn't add anything to the game, and I can understand how someone who doesn't have the same fond, nostalgic memories would dislike the movie.