I live in a town that has no local FGS. We normally play at somebody's house, but when I go to tournaments, I assess the store to see how well I think it supports gameplay in order to help me decide if I will be back. Some just stick a spot in the back of the store with folding tables and others are really good with tables made for miniatures and spaced out as a dedicated shop for games.
What are your experiences?
What is the worst and best places you've played at?
Once of the nicest gaming stores I have been to is Meeple Madness in Braselton, GA.