Overall I really like this Civ in terms of immersion but I do agree with those who worry that the civ abilities are a bit too passive. Unlike some of the other civs it's hard to affirmatively take advantage of their unique abilities. Finagling things so that you can build missionaries of other religions feels game-y and not fun -- otherwise you're just hoping they spread religion to your cities. And the war weariness thing is not going to be enough to make you more aggressive just to cause war weariness. Unless they make trade routes really strong religion-spreaders or something.