Among the big-complex-megaplex airports, AMS,HKG,ICN,SIN are amongst the best.
Amsterdam is very easy to traverse, so is Hong Kong. New Seoul and Singapore are super clean and efficient too.
U.S based airports do not even begin to understand the experience these above mentioned airports strive to create. Dining options in Hong Kong,Singapore are amazing.
Worst: How about an airport that is just a runway ? Tamarindo, CostaRica = No checkin, No arrival and departure lounges
