Really this was one of the most badass game I've ever played, with memorable scenes, characters and backgrounds, as they state in the artbook: "this game feels exaggerated but believable, realistic yet fantastic"
I loved the Germericana level in particular, that was an epic level design, and the world, the U-boat they live on, the details Bethesda manages to create are just marvelous.
Just look at those concept arts, OMG, you really have to play this if you haven't already.