CNN has published a list of the world’s best and worst airports. As with all lists, one can wonder at the criteria for inclusion. For what it’s worth the best are Hong Kong, Singapore, Seoul, Kuala Lumpur, and Munich. For those traveling to Italy with us from the U.S. only Munich will be on your radar screen.
As for the worst they were Baghdad, Delhi, Nepal, Senegal, LAX (Los Angeles), Heathrow (London), and Charles de Gaulle (Paris). I would concur with de Gaulle. I always advise people to be sure they have a long layover at de Gaulle because it is maddeningly spread out and convoluted!