the capital of america don' have much of gothic, deco art, neoclassical in it, the architecture is just dc with brand recognition, and no it is not like the classic, they are few uses for art deco for a place like the capital
the generic diselpunk means the robots, technology, armor and clothing are all industrial and 1940ish, the vault suit from tight suit rubber uniform like how people from 50s imagined are now jacket like, t-45b is generic diselpunk ripoff from t-51b, and mr handy and the rest of the robots are diselpunkish, and about guns, did you see the combat shutgun? they are plenty of bad designs and ugly, energy weapons are the biggest victim of this aesthetic
3 is better than 4 in this aspect sure but not that much , assaultrons feels out of the aesthetic more than any robot redesign (though they are still hot) and the cartoonish buildings are the peak of the flanderisation of this franchise, but the 3 stared it and it wasn't any near to the original