One of the most contentious issues around Xbox in recent years is the management of the Halo franchise.
Halo was to Xbox what Mario is to Nintendo. For years, it was Halo that led the tip of the spear for Xbox's surge in the gaming industry. The innovation with multiplayer and console-oriented shooters in general helped Xbox drive a wedge into a very established gaming industry. Halo 3's launch was legendary, and Halo game launches in general used to be "events." Those times are long passed.