1. Can't build holy site, thus building a lot of others like CH, Academy, grabbing a lot of GP from you 2. Don't have a unique improvement, this is important because I have seen some Civilization like Scythia building a lot of UI which seriously limiting her development in the future. 3.Born among jungle, making a range unit rush very difficult, and your army are marching slowly. They can build swordman without iron, which make his city hard to take early compared to which lack of iron. 4.Because of 3 I don't feel like rushing it early game, and because of 1 and 2 they can develop quite well. When I enter Industrial age and every other AI fall behind they are the only which can catch up with me or even ahead of me.