Despite it having more or less the same graphics tech it's a very different game. It's slower paced, more atmospheric, and with more story. The story in doom wa

Despite it having more or less the same graphics tech it's a very different game. It's slower paced, more atmospheric, and with more story. The story in doom was a single page of text after beating each episode. Marathon had in-game computer terminals where they drip fed the story of the Marathon and its AI that was going "rampant" (interestingly Microsoft borrowed that idea for Halo 4, the first one that Bungie didn't create).