From Wikipedia (though I can always get the same thing from another source, if you'd prefer):
"The plot revolves around the last ditch effort of the US and Britain to fight the Chimera across a war-ravaged British landscape."
So... a European war in the mid 1900s? WWII might not have happened in this timeline, but there's something awfully familiar about that premise... oh wait, every war-based FPS in creation, that's right. Fictional or not, it retains the same feel, with the only difference being the melding of sci-fi suspense in the form of invading aliens, which as I said is nothing new or inventive for an FPS storyline either. They just took the 2 most common FPS scenarios and cobbled them together, which if I'm not mistaken has already been done with the Wolfenstein franchise. I'll reserve my judgement about how that works out for the game, but to say that it's something fresh instead of two absurdly common things put together is just as much a fallacy as saying that Metroid Prime does nothing new (which, BTW, I never said it did, so you can kindly stop putting words in my mouth) when people have ripped on and complained about how different it is since its creation. Calling out Prime 3 as unimaginative may be correct, but it's a sequel to an established franchise, what's Resistance's excuse?