I find it interesting reading different people's perspectives and experiences at airports.
We generally do a big trip each year for 6-8 weeks and its often a round the world affair as we tackle various items on the "gunna" (aka bucket) list.
My 2cents worth on major airports from the last 3 years. We have been to plenty of dubious smaller airports I'll omit:-
FRA - been through FRA 4 times in 3 years - I absolutely loathe the place and will do everything in my planning to avoid it forever more. The walking for miles, the security process, the rude lazy disinterested staff, the delays, you name it.
LHR - been through LHR 4 for 2xstop and 2x transit and each time must have been very fortuitous given others comments, breezed through immigration and security and sat around waiting for a long time for our driver because he expected us to be delayed.
NBO - Dreadful place, dirty, aircon not working, hopeless check-in security and boarding processes, no toilets in gate lounges.
TXL - Very "unique" arrangements for departures. Had premium lounge access so didn't have to wait around near the boarding gate and didn't concern me. But if not lounge access it would have been chomping at the bit at lack of seating, space, queueing.
LAX - TBIT gradually improving but still at lot to left to improve; terribly long queues to get through security that take forever, I avoid if possible.
MEL - International departures is going from bad to worse as each new "improvement" is delivered, the IKEA style maze to get through all the retail in international is draining and frustrating. Many of the food outlets are a national embarrassment.
MIA - arrivals was a total mess, understaffed immigration & customs, huge queues, a major hike to get to any form of transport away from the airport.
HKG - a great airport
SIN - a very good airport
KUL - layout not too bad and well maintained but assertive aggressive security who take random body searches into private areas way beyond acceptable practice.