Like:
I think few would disagree that overall, DCA is a good airport. Plenty of things to do and see, and oh so close.

So-so:
As stated earlier ATL is a good airport if you are on AA. But the lines are often long, and it's a workout to get around. But I think that the layout is very easy to understand. If you get confused at ATL, you shouldn't be flying alone.

MEM has a lot of walking, too, but there are a lot of food choices. If you like barbecue.

Dislike:
The only times I have experienced LAX have been to make an international connection, so I have a bad impression of it.