If we're talking about "A for effort" movies, Final Fantasy: The Spirits Within is at the top of the list. With a top-notch voice cast, animation that was outstanding for its time and is still passable today, a well-developed fantasy/sci-fi world, and a legitimately amazing score (the best part of the movie), Square Pictures spared no expense in giving this film the highest production values it could receive.
It's too bad the movie isn't that good.
The characters are flat, the story follows formula too closely, and the second half gets bogged down, turning what could have been a sci-fi event of the era into merely passabke entertainment. I really appreciate the way this movie tried to be something special with grandiose worldbuilding and heady philosophy personified on-screen, but the execution wasn't great.
Still... I can't fault the movie for trying really hard. So I give it a C for quality, but A for effort.