I guess the only reason Heathrow made it was due to Terminal 5. It's the only redeeming feature. Although the shops were too expensive/high class for somebody like me who wants to pick up some reading material and a teddy bear for my little cousin. The East and South terminals suck... so many horrid memories of T1,2,3. Apparently a horrible airport for pilots too (other than the "prestige" factor).
Mostly Asian airports are clean, spacious and efficient, so no surprise they dominated the top.