Marathon isn't deathmatch gone wide, it's multiplayer Alien: Isolation and every other player is a xenomorph

The human colony on Tau Ceti IV has been abandoned for half a century, as far as anyone can tell. The only exports leaving the planet are those nabbed by Runners in mechanical bodies, like fruit pickers at the end of the universe. But there are imports, too, of a sort: elements pulled in from other extraction shooters, which reveal the kind of experience Bungie wanted to make.