Story: the best part of the story is that it is set in the future, where all we know (MS Gunda, Zeta Gundam, etc) is old history, even the Newtypes are sort of a legend sometimes. This gets your attention right away. Another important aspect of the story is how mature it is. It is extremely centered on family struggles, relationships, and some war tragedy, it even has some strong scenes. The political aspects, however, are overall lame. They are another "we defeated the empire, but someone is trying to do the same". Star Wars send its regards. Thus, you will be more rooked about the characters than the political aspects. Nevertheless, it is an entertaining story, where you want to understand what is going on. Imagine that you are seeing a mix of Zeta Gundam, with Gundam Wing.
Art & Sound: The art is absurdly awesome for 1991. The artwork is so damn good that the shows appear to be made in 2007 and transported to the past. I can`t say much about the soundtrack, because, in terms of music, nothing stands out.
Characters: They are well made. They don`t act dumb or irrational, they are not overflown by lame romantical plots. All feels more natural and organic, like something that could have happened in real life, if all of these things were possible. The protagonists have particular stories and their own reasons to fight, which adds to their decisions and the overall lore of the anime. There is no annoying character, which is always a win, and the main villain is kind of cliche but works well.
Mechas: Gundam F91 is a cool mecha. Some of its mechanics were the inspiration for Freedom`s arsenal (Gundam Seed), and clearly for Unicorn`s NTES (Gundam Unicorn). The NPC mechas, for me, are the most awesome NPC mechas of the franchise, surpassing even the Grazes (From Iron Blood Orphans), which were my favorites so far. They are like futuristic versions of the Zakus, but without the lame look they had.
Overall, this is a great movie. I think that one of the best Gundam movies of the Gundamverse, losing only to Stargazers (for me). Don`t miss out!
