I have visited the USA a dozen or so times over the past decade and, as well as having a great number of friends there, I've found the people really friendly and welcoming.

The only exception to this are US immigration officials who I dread dealing with everytime I arrive. All my paperwork is in order and I've never visited any of those 'dodgy' countries but they are just so unfriendly and standoffish that it spoils my arrival. I get the impression they assume every arriving person has no right to enter and should be treated almost like a criminal.