My biggest shock with Civ was funding out that I was a military dictator at heart.
I started with hope of a cultural victory. I gave away technology and trade at a disadvantage to keep aggressive allies on my side.
Then genghis khan attacks me unprovoked despite previously good relations.
He sacked a city and I decided he needed to be completely removed from the game for peace. So after stabilizing, I built up a huge military and defeated him.
But now I had a huge military draining my resources. And alexander was pretty aggressive. Before you knew it, my wife was begging me not to attack the last survivor, Gandhi. Which I defeated and achieved world domination.
I was literally horrified at myself.