It's a very rare and unique twist for a Gundam game.
Instead of giving you an unstoppable mobile suit that can solo an entire army on its own, you're in charge of a platoon of mobile suits and must maneuver them in a tactical manner similar to the Rainbow Six games. Your units are quite fragile too; take a few hits, and you're out of the fight, and if you encounter something like the legendary Gundam itself, your best strategy is actually to evade or run. Even stranger? You play as the Principality of Zeon; there's no "good guy" Earth Federation campaign to be found, bar a few "simulation" bonus missions.
I'm hoping GOG takes an interest in reviving this one, as Bandai-Namco generally doesn't care much for their older titles, and since it's a Japanese PS2 game, finding physical copies can be challenging.