I think I understand you now. I can not speak for everyone, but I think the notion "crater" was not to be taken literally here like as New York would be hit by a giant asteroid which would leave a no clue 50 foot crater or what ever. At least that's not what I meant so sorry for any misunderstanding on my part I was being merely hyperbolic. Nukes usually detonate in the air anyway for maximum structural damage, so there would be probably no crater. Unless we're talking about bunker-bursting weapons but even those leave only
small craters. But I think it is fair to assume that pretty much most buildings would be levelled with just the bare skeletton structure of a few of them left.
The point I am trying to make is that with a full nuclear war and the cold war is the only reference we can use when it comes to the estimated number of nuclear weapons it would probably leave a state like New York so devastated that you would be lucky to find any noteworthy life or structures left, leave alone the radiation that would probably do the rest. Survival would be literally impossible I think. But this is all very theoretical anyway. This is what I mean when the games, like F3 and F4 are not realistic, if you so want. But hands down I personally believe humanity would not have survived a full scale nuclear war like between the NATO and Warsaw Pact states anyway. Not with more than 45 000 Nukes going off.
If we're talking about the Fallout games in particular. Bethesdas visual representation of the destruction is I think wrong from a more realistic point of view as there is way to much structure still standing in their games particularly after such a long time. I would be surprised if anyone could tell that there was a real city standing even after a few decades. Why do the Bethesda games still show such kind of infrastructure and landscape? Probably because they want the player to have something interesting to explore and not just keep everything a flat surface, desert or what ever with some rubble here and there overtaken by vegetation and erosion. You could say what Bethesda is showing here is an extremely idealised idea of a nuclear war.