I disagree with you. Never heard of marathon so couldn't be that good.
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It's something that generally speaking only fans of Bungie are aware of, also it may be relatively unknown to some of the young guns on here.
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While I disagree with the OP, Marathon is a well known title amongst Bungie fans. A lot of the tropes and aesthetics Bungie are known for can be traced back to that series, especially Halo (and Destiny for that matter).