This game was a masterpiece before it was taken off of Xbox Live. In it's heyday, players could participate in massive, online battles for territory in fully customizable mechs... but nowadays all that's left is the single player functionality, which is still fantastic, but much diminished from the multiplayer experience.
Players can still expect a lovely single player game, unique among other titles in the genre in that the implementation of mechs into the game feels realistic. The mechs do not fly around weightlessly, don't have magical powers, and don't combine into the Megazord-esque monstrosities. Instead, the focus is placed on the teamwork of a squad of "hounds" (the mechs in this game). Every squad member fills a specific role in the squad; trying to build a hound that excels in all roles just makes you terrible at everything.
Possible roles include:
-Sniper - A hound specializing in long-range ballistics capable of firing on almost anything it's pilot can see.
-Soldier - A mobile hound that excels in skirmishes on the front line, frequently outfitted with shotguns, assault rifles, or short range explosives.
-Scout - A stealthy hound to whom mobility is paramount, lightly armed and armored scouts are often used to capture objectives and gather intel behind enemy lines. They are often "spotters" for heavy gunners.
-Defender - Typically the most heavily armored (and slowest) hounds in the game, defenders are short ranged defensive specialists that protect critical objectives and chokepoints.
-Heavy Gunner - Unique in that they can fire on enemies they can't see, these hounds fire mortars and rockets to distant targets, over mountains and buildings. A "spotter" increases their effectiveness tremendously.
-Commander - The glue that holds a unit together, these hounds monitor the battlefield and coordinate the movements of all other members in a squad to best effect.