I'm just right now skimming through the falloutequestria wiki. All I can say is I will never read the story(s). The more I skim through it, the sadder I feel. These two things (mlp and fallout) don't belong together. I'm happy for Kkat's success with this writting endovor, but I hold to my feelings that this story is something that has perverted what the show is all about.
It hasn't...several times, the story of FoE feels like the show if the show allowed mature themes. The story follows the growing friendship between a group of important characters put in the post-apocalypse of Fallout's universe.
Sure, it's a dark and gritty setting, completely opposite to the show. There are people to whom I would not suggest this story, particularly if they have trouble with gore, sex, death and allusions to such things. But I don't think it perverts MLP; I think it borrows the lessons and some of the settings, and applies them to a new scenario.