Pleased to see Dubai in the bottom ten, particularly T2, I haven't used T3 though.
Brunei was an interesting experience, just not in a good way.
In a 3rd World country I received the full VIP treatment, met at the foot of the aircraft steps, and was driven into the tea garden whilst my luggage and papers were dealt with on my behalf, on the return I was taken to the VVIP lounge. It was a surreal experience!
If been to some quirky airports in the Caribbean and so called international airports that had their own charm.