Gundam Seed is pretty good anime series. That proves also numbers of sequels and Gundam Seed Destiny, which is more of a second season of Gundam Seed.
Gundam Seed tells its story slowly, almost epicaly. The characters evolve and are bending under the circumstances of the cruel world they are living in. The main character is Kira Yamato, coordinator living in neutral space colony. When the war comes even to the neutral countries, he is forced to choose side for which he will fight.