LaGuardia (LGA), United States
Not only is this the worst of the 3 NYC airports, it’s one of the worst in the United States and the world. The place is bleak, old, and filthy. It’s been called a “disgrace” and is constantly over crowded and slow moving.
Ok, so it’s a little dirty and slow.. I should also mention the only public transport connection is via a slow city bus. There’s also no cell reception. And no free Wi-Fi.