Seems the points on analysis were not only limited to the aesthetics and quality
rather integration and public transportation. Such as the moment
you leave the Thai airport the drivers attack one with packages,
rather in Singapore or kuala lampur much the opposite.
I have flown through Beijing Airport, it does not deserve to be worlds 3rd worst in the world.
Check out the source of those rankings, very dodgy,
Best & Worst Airports | Asia 2010
I personally find this one more credible.
full list of winners | AIRPORT SERVICE QUALITY AWARDS