Though dated, Victoria 2 stands out for one major reason: the simulated population. You are not just the puppet master of your country. You are the leader, but your people will react to the choices you make, and every action has an equal and opposite reaction. Go ahead, declare war on that country - but if you don't have your people's support, they may rise against you. Pass that reform and it may make the liberal majority happy, but it'll bring the far more militant reactionary minority to arms. The player isn't the center of Victoria 2 - the people are. That's what sets it apart.