Two of my favorite qualities in an airport:

1.  Be a small, older, in-town airport.  Examples:  Love Field in Dallas; Hobby in Houston; Long Beach, Burbank and John Wayne in Southern California.

2.  Have the rental cars at the terminal, rather than some desperate, annoying shuttle trip to the far edges of the known universe.  Examples:  Orlando, Buffalo, Madison.

When I get off the plane, I don’t feel like waiting for boarding and riding some stupid shuttle.  I want my car and I want it now.