This anime has since been re-reviewed in a more comprehensive & detailed manner via Retrospect in Retrograde, which you can read at this link.
Next Senki/Record of Next War Ehrgeiz, translated as Ehrgeiz: The Next War in its North American release, is one of the early examples of late-night anime, which got their big start in 1997. The animation budget is low, as were most of them at that time, it's mostly obscure now, as a fair number of them also are, and the story isn't anything amazingly special... But I can't help but really enjoy this title.
In the future the people of Earth start expanding into space by creating the "Next" colonies. Years later Next would rebel, forming the Next Government and starting a war with the Earth Government. This prompted both sides into modifying their MVs/Metal Vehicles, the giant mechs of this title, for battle use. In the meantime, a third force appeared in the form of Terra, who rebelled against Earth and wanted peace to return. Throughout all of this, Next started experimenting and created S.A.C (System of Absolutely Conscience [ah, Engrish]), or "S" for short, an MV-like being that broke free and escaped from Next. All the meanwhile, a small batch of unknown outlaws make their living pilfering weapons & rations from any nearby ships that come by their home of Next 7, a colony which was ravaged during the war.