I have to agree. I don't know what people are talking about that like LAX. It fucking sucks compared to many other airports similar in size/traffic.
With the major airports, sometimes it's more about the terminal than the airport itself. The newly renovated Terminal C at IAH is really nice, whereas Terminal A is pretty plain. DTW added a nice terminal for Northwest, but if you were flying Southwest you ended up in the original terminal that was an absolute shithole. I think that's since changed, but I don't connect through DTW like I used to.
I have several favorites, but Koh Samui sticks out the most for me. Taipei is also pretty nice, but I also believe that varies by terminal.