Not a foodie so can't comment on that, but in general America is a very big country so tends to have the best and worst of everything. As a matter of principle I am sure that anyone with deep pockets and the right know-how can have an outstanding dining experience there.
I've had great food and service in the US in cheap, middle and high-end places. You get what you pay for in terms of food and service is generally good anywhere with a la carte service.
My favourite US eating experience was a side of the road one man hamburger grill North of LA. Simple jalapeño cheese burger in which everything was completely perfect. Best burger I have ever had - only cost a few bucks.