I'm unclear if you're familiar with the Marathon IP, and just discovered the new game they're making, or if you're just discovering Marathon as a whole, but if it's the latter, you might be interested to find out that there were 3 games in the Marathon series already, released back in the 90s, around the same time as Doom / Doom 2, and they were incredible, as one of if not the first FPS with a heavy focus on storyline over just run and gun shooting. What's more, you can play them for free, through this open-source engine that runs the original map files, and has been endorsed by the game's original creators.
I was unfamiliar with Marathon as a whole, but the YT video I linked did mention there were other, older games. I wonder if the new game will take much from the older ones...
Thank you for the link, I'll definitely give them a try :D
Based on what we know of the new game (which isn't much), it appears to be a sequel of sorts that takes place well after the events of the original games, as far as storyline or theming goes, but the gameplay looks like it'll be quite different.