Yes, it used to be one of the best airports in the world.
Unfortunately it has taken a MAJOR hit recently as it simply cannot cope with the increased number of passengers.
The short line ups for immigration/security that used to be a feature of Incheon are gone!!! Now are horrendous long line ups and a surprising level of disorganisation in their immigration system.
When there's line up's taking 45 minutes....why are not all the immigration lanes staffed???
Ok they blame the influx of Chinese visitors in recent years but this is a poor excuse - the airport has to manage it.
One additional point - there are no security/immigration lanes for business/first class passengers. Strange!
Very sad to see an airport which I have complimented before becoming so bad. It is VERY VERY frustrating to travel in this airport now.
Management - please note and do something about it, it's in your power!!!