OTTG writes: "When a game does something right the normal course of action is not to change a thing. This is exactly what Bungie's thoughts probably where when making Halo 3: ODST. Yes they have change the main protagonist. Also you can't duel wield or hijack vehicles. Plus you have a health bar to worry about. But at the foundation of ODST is the same solid formula that has worked for the Halo series since day one."