In the preview stage Revolution looked like a good, rich expansion - four new multiplayer maps, a new arena, new additions to the zombie mode and a new machine gun. Unfortunately every positive aspect has a negative counterpart. Downhill is an excellent map, but there's also a poorly made Hydro, and Mirage and Grind - while interesting - are too small to reach full potential. Zombie mode has a cool Die Rise, but on the other hand Turned is atrocious. The balance of the universe is intact, but Call of Duty fans surely wanted more. Revolution is a mediocre opener for a fully paid "season".