Mobile Suit Gundam: Federation vs. Zeon
PlayStation 2Mobile Suit Gundam: Federation vs. Zeon is easily one of the most enjoyable Gundam games to date. The gameplay mechanics are sound, and there's enough variety in the missions that you won't become bored with either the arcade or campaign mode too quickly. Even after you've completed those two options, there's still a versus mode where you can go head-to-head with a human opponent as well as two other computer opponents. Gundam fans will probably get the most enjoyment out of this game, but fans of giant robots fighting each other will undoubtedly have some fun with it as well.
PlayStation 2The fan-colored sunglasses caveat may apply here, as I mentioned before. If you're a follower of the Gundam anime, that's not any kind of problem, but if you're looking for quality mecha action, it may be. I still maintain, however, that this is the best game to appear in the canon yet, both for single-player and split-screen action. The arcade-style controls and breadth of available mobile suits offer a lot of fun for fans and non-fans alike. And anyway, whatever you think, I still love my Gogg.