Playing a few games without characters really helped me to get into the game, just because it allows you to see how the economy and military works without all the character modifiers on top. Old World is often described as a mix between Civilization and Crusader Kings. That's not wrong, but the setup options allow you to decide the exact mix, ie how much - if any - Crusader Kings you want to have with your Civilization. And with the Barbarian Horde scenario, you can turn the game into Colonization! I'm tempted to say "Old World, at least three games for the price of one", but that would miss the point that all these game modes still feel like variations of the same game. The core mechanics as well as the presentation (mainly the map itself, but also aspects like event artwork and music) create a coherent atmosphere that feels special and pleasant.