Gundam War is a fan game that isn’t even complete, yet I am willing to say it is still one of the best Gundam games ever planned. While retail mecha video games have been(for the most part) garbage, I have faith the fan community can release something at least half way decent.
Before entering the download page, you are greated with text referencing a special attack usable only in team Mode, and this: The password for the archives are the author’s name, in lowercase. Helpful piece of information right there.

What do we have to look forward to in the full release? Future Century, After Colony and Universal Century Mobile Suits. Character sprites are ripped from Gundam Battle Assault, Mobile Suit Gundam: EX Revue, Gundam: Endless Duel and a few other 2D games.

Like Long battles? Good, The Gundams in this game will have a butt load of hit points. Have fun chipping away at the opponents lifebar(that is, if you don’t know how to adjust it in the characters file…)

The battle system will be simplafied, but not to the extent of a Tekken or other button mashers. Basic combos are mapped to one button. Activating more advanced attack paterns requires multiple buttons to be held down at once.

The Gundam War message board has a thread explaining the battle system in more depth than I care to give. Also, the game’s impressivly large(if not insane) roster is listed in one of the W.I.P. forum’s sticky threads.

Gundam War
Gundam War Message board