AdamGM
Warlord
In my experience, considering how disastrous the world congress can be, spies are vastly more useful helping you maintain city state allies.
For example, I don't know if it's possible for other Civs to vote for you as a world leader or not (I haven't found a way), but the information seems like it falls into tied hands if you don't have the votes to counter the info you have received.
(I wish you could, for example, put two spies in one Civ's city, and use that to persuade the Civ. i.e. use spies for persuading more than city states).
For example, I don't know if it's possible for other Civs to vote for you as a world leader or not (I haven't found a way), but the information seems like it falls into tied hands if you don't have the votes to counter the info you have received.
(I wish you could, for example, put two spies in one Civ's city, and use that to persuade the Civ. i.e. use spies for persuading more than city states).