Question to the people who voted to always settle in the spot they are in:
Do you restart if you start on a mountain/swamp?
I voted for one move but I rarely insta-restart any game. The most fun time of a civ game is the beginning when you are revealing the map, finding neighbors, establishing your base etc. I almost always will play at least the first 1000 to 2000 years to see what develops. Then I evaluate the situation for how much fun it looks. I don't have to be the most powerful or have a monster start to keep going but if I have few or no nearby neighbors, a massive jungle/swamp/desert/moutain range that makes growth near impossible, etc and just doesn't look "fun", then I'll start over before investing serious time in a game.