I havent read the whole thread, maybe someone has addressed this already but Biscuits.
I had them once in the states and they were chewy dense, dry and served with a white sauce. dry savoury scones, awful.
But them we went to new orleans and had biscuits that were gorgeous. flakey, buttery, warm and I couldnt eat enough of them! We had them with eggs benedict, fried chicken etc. So I do think these things are very dependant on what part of the country you get them in, as well as who makes them.
I adore a lot of american food, chicken fried steak too can be fab, again depending on where you get it from!
I do find a lot of american cakes and shop bought desserts to just be full of sugar with no depth to them, but then theres home made pe shops that have divine desserts so 6 and 1/2 a dozen!