Marathon is burdened with the past. Its twin namesakes, the titular colony ship and the trilogy of classic boomer shooters for the Apple Macintosh, are both corpses plundered for new life. The protagonists of this new, rebooted game are scavengers, quite literally picking over the bones of what came before.  This fact has colored the reception of Marathon from its very first announcement. The fact that Marathon was set to be a pure live-service game, with no single-player component, was…