I understand that that Great Explorers and Great Admirals would need need an overhaul of the game, but surely you can agree that they are more deserving of a spot then a Great Spy. As many have already stated, who will these people be? A truly great spy is unkown, because thats what makes a great spy.
I don't agree. Introducing a great explorer or a great admiral would add nothing new to the game - would serve no point. There are many uses that a great spy can be put to;
1) settled in a city; reduces 'it's too crowded' unhappiness by 10% - 20%
2) has better odds of completing spying missions.
3) can create a center of espionage operations in other civs (reduces risk of missions in that civ)
4) can create an espionage center in one of your own cities which provides bonuses to the amount of espionage points generated by that city.
I'm not saying that all of these can or should be implemented. I'm just saying that there is lots of room for improvement in espionage and a great spy unit can provide a game mechanic to unlock some espionage features.
I also consider whatever acts the great spy unit performs to be of greater significance to the game than what the spy happens to be called. I do hope that the whole world doesn't recieve the message 'John Smith (great spy) has been born in London' but that's because the presence of spies should be secret.
Spying does need an overhaul. I'm glad that the espionage slider is being introduced for two reasons:
1) in CivIV terms, an espionage slider is essentially a foreign policy slider.
2) I'd much rather see more advanced espionage conducted through a new game mechanic than solely through spy units.
The espionage slider may prove to be a poor addition to the game but there's no reason so far to dismiss it.
An intelligence overhaul is badly needed, but I don't think this was the way to go. I'd have preferred a more Civ-3ish way of doing things, with a centralized control instead of more units to move around. And I don't like having to sacrifice money and research for better spying. But I'll hold off judgment, for now...
I prefered CivIII's espionage as well (about the only mechanic I prefered in that game). But you did have to sacrifice money and research for better spying in CivIII. An espionage slider that acrues 'espionage points' isn't much different to from paying for espionage with gold.