I really like that the Fallout elements of the crossover are justified according to the MLP setting. And Littlepip uncovering what happened to the Mane 6 is really good too.
But it can sometimes be dark to the point of absurdity. As in it doesn't just clash with the tone of MLP, it clashes with the tone of Fallout.
It's still a top-tier fanfic. But I've grown somewhat tired of it by now. And the show canon is now grimdark enough to fill that role for me.