The first-person shooter added online multiplayer to the proceedings, and despite a universally reviled cliff-hanger ending, it was really something special on the Xbox. Three years later, it's now available as one of the first Vista-only PC games. It's still easy to see why this game was so loved on consoles in its day, but when you put it in direct comparison with recent PC shooters, it loses a ton of its appeal, making it best suited for Halo fans who want a good way to play or make custom maps.

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