I can't think if an airpor6t I don't like. Ones I know best and like most are:

DTW -Hometown airport. Got a special place in my heart plus a nice new terminal and another one coming in a few years.

MSP - another special place for me.

DCA - I like the way it is setup (mostly), and it is near town, and has a Metro stop.

If I had to choose something I didn't like it would be BWI's lack of good spotting areas. The children's play area and aviation exhibit area makes up for that though.