Yes, the two expansions add a ton of game mechanics that bring much more depth. However, I've found that the only time I really enjoy Civ5 is when playing with

Yes, the two expansions add a ton of game mechanics that bring much more depth. However, I've found that the only time I really enjoy Civ5 is when playing with friends as we backstab each other. Unfortunately, the AI in Civ5 is pretty poor, with harder difficulty levels simply giving the AI various cheating advantages.