Halo: Combat Evolved, the first game in the series, "really defined an entire gaming platform," said Dan Hsu, editor-in-chief of Electronic Gaming Monthly.
Halo and Halo 2 have gone on to sell 14.8 million copies on the Xbox and PC, according to Microsoft.
"When you look back at when Xbox launched, there was this cold software company trying to get into the gaming market," he said. "If it weren't for Halo 1, who knows if there would still be an Xbox."
And despite Halo 3 being the final chapter in the story arc, it doesn't appear the series will be fading anytime soon, Jarrard said.
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