From Call of Duty to Killzone, for ten years, Halo has influenced the evolution of shooters.
It is arguable that without Master Chief, you'd be able to carry eight bazookas, a dozen submachine guns, and 42 grenades into battle in Call of Duty: Modern Warfare 2. So the next time neo-Communist troopers grind your hero into the front lawn of Main Street USA, put blame where blame is due.
