Likes:

DCA-convenient to the city
HPN - but only if traveling to ORD, PHL, DCA, or any other direct destination. Otherwise, forget it, because it guarantees having to make a connection.
ORD - good food choices, good planespotting and people watching
YVR - shops and services in the "U.S." terminal are terrific (okay you didn't ask for non-U.S. preferences)
LGA - easy transfer from the curb to the gate
PBI - like LGA, easy transition from the curb to the gate

Dislikes:
DFW - could the car rental terminal be ANY farther from the terminal
MIA - I could go on for days about why I hate this place
DFW - I think they strategize on how to make my connections as far apart as possible
LAX - uninspiring