Professionally-produced scenarios with customized art/graphics/units, game mechanics and customized (professionally-produced) AI, maps etc:
1) Rise and fall of Rome
2) The wars of Alexander
3) Napoleon Bonaparte's conquest of Europe, including the battle at sea with the British! (Waterloo or whatever it was called)
4) The World Wars
5) The Crusades
6) The cool Charlemagne scenario from Civ4, where you get to bribe the Pope
and fight the evil heathens, pagans and Arabs!
7) Any other cool-type scenario for example the rise of Islam and the conquest of all of north Africa, Turkey, Spain etc!
edit: 8) American wars of independence!
9) The Spanish conquest of Mexico!
etc
I'd pay big bucks for some decent scenarios, as opposed to the crappy ones added as an after-thought to most of the previous Civ expansion packs
Why am I so prejudiced against user-made scenarios? Um ... basically because the art work is usually (by necessity, since these fan-made mods cost nothing and are made by enthusiasts rather than professionals) 'not so good', the AI is not customized specifically for the demands of the scenario, and, well, they are just rubbish in general ... for example Dale's 'Road to War' WW2 mod - what a disappointment that was!
1) Rise and fall of Rome
2) The wars of Alexander
3) Napoleon Bonaparte's conquest of Europe, including the battle at sea with the British! (Waterloo or whatever it was called)
4) The World Wars
5) The Crusades
6) The cool Charlemagne scenario from Civ4, where you get to bribe the Pope

7) Any other cool-type scenario for example the rise of Islam and the conquest of all of north Africa, Turkey, Spain etc!
edit: 8) American wars of independence!
9) The Spanish conquest of Mexico!
etc
I'd pay big bucks for some decent scenarios, as opposed to the crappy ones added as an after-thought to most of the previous Civ expansion packs

Why am I so prejudiced against user-made scenarios? Um ... basically because the art work is usually (by necessity, since these fan-made mods cost nothing and are made by enthusiasts rather than professionals) 'not so good', the AI is not customized specifically for the demands of the scenario, and, well, they are just rubbish in general ... for example Dale's 'Road to War' WW2 mod - what a disappointment that was!