In my experience entering the US has become far less pleasant. In ranking terms (worst for Border Protection / immigration rudeness and slowness)
Miami - three times worse than the next
JFK - pig ignorant
ORD - ignorant
SEA - dull
Orlando
SFO
Las Vegas OK
Newark OK
ATL Efficient
Cleveland Very Efficient
Bangor pleasant
Dublin (capital of 51st State of USA
) Very pleasant
My experiemce