Civilization 4 was good at launch. Naturally it got even better over time.

Worth a mention that 4 is the most recent of these games released primary on physical hardware. That meant patching was a more difficult process so they actually had to hire a bunch of play testers to test stuff (and fix the problems they found). Contrast that to the approach of the most recent three games, which had their customers pay $70 for the privilege of being beta testers.

This is a shitty way to develop games. We should be mad about it because we deserve better.