1. a more improved combat system, like make it worth someting if its a gun powder unit, or an aromor unit, more rock paper scissors style stratgey in stead of brute strength
2. palace upgrades!
3. make the internet worth something more than what it is like places a lab in every city
4. better worker automation options ex. you tell a city you want it to focus on production so the workers automated around that city will focus on building things that increase production in the city
5.More aggressive ai
6. allow custom maps in custom games
7. a better world editor like in civ III, man i was a pro at that thing
8.helicopter transports, and what happened to paratroopers?, also gunships should get the rebase option or the ability to use railroads
9. able to trade anything for everything, i liked being able to trade wines for gunpowder and what not
10. the ability to get other nations to form defensive pacts so you can have 3 way defensive pacts and what not
11. slavery should not only allow you to hurry production but you should have more production per turn, however your people should be a little less content, and get pissed off when other nations have emancapation and theyre stuck in slavery
12. im down for that 2d, i have to take a good break every few hours cuz it kills my head
13. MORE AI AGRESSION!!!
14. nuclear missles would be nice, along with the nuclear submarines, along with cruise missles, also you should have the mahattan project built to build the sdi, i dont like haveing the sdi before the mahattan project, after all how can you defend against something that doesnt exist?
15. a type of modern infantry instead of infantry upgradeing to mech infantry
16. civ3 bombardment rules
17. the ability to silence sound effects like when buddhism spreads and the reading of quotes when new techs are researched, i cant get those buddhism sound effects out of my head when i sleep or am at work its driveing nuts
18. Every civ should have two unique units due to the fast paceness of the game, one in the ancient earas and what not, and then a seprate for the modern era
19. i would like to see more technologies
20. go back to civ III spies, or make it able to steal technologies
21. If you found a religion and you capture a city that worships the religion you found they revolt for less turns, also they should be more willing to turn over to you, as a direct result of this if a city has two or three religions, when clicking on the city for info it should say like 20% is christian 50% is isalm and so on, and you can increase this precentage by sending more missionaries, you can also chase other religions out of the city by bombing it with missionaries
well this is my two cents.... i think 2d would be totally sweet, but i know it wont happen