LaGuardia is funny because you go to terminal C and D, newly renovated with nice restaurants and fancy tablets at every table

...Or you could walk 10 feet to terminal A and B and get drenched by the gallon of water leaking out of the ceiling

In general, most US airports are pretty bad, but I'll avoid Terminal 1 at JFK at whatever cost. It's by far the worst airport terminal I've been to in my life.

I read this week that each of JFK's terminals is run as it's own separate entity. If your flight goes to Terminal 4, and Terminal 4 has some issue or is overloaded, you can't go to any other terminal because they don't talk to each-other.