One thing I would like to see in CIV5 is your relation to another Civ have some mechanical drawbacks/benefits when it comes to war.
I don't mind a Civ going to war with me when they are happy with me if I'm vulnerable. But if there people love me, that should accrue some additional war weariness or whatever the CIV 5 equivalent is.
This should also work for the player. If a neighbor CIV gives me gifts or gives in to my demands, my relationship with them should go up....making it more costly for me to go to war with them. This forces the human to behave more realistically, instead of not giving a crap about your relationship with another civ when going to war.
I don't mind a Civ going to war with me when they are happy with me if I'm vulnerable. But if there people love me, that should accrue some additional war weariness or whatever the CIV 5 equivalent is.
This should also work for the player. If a neighbor CIV gives me gifts or gives in to my demands, my relationship with them should go up....making it more costly for me to go to war with them. This forces the human to behave more realistically, instead of not giving a crap about your relationship with another civ when going to war.
and also mind language 
