First of all, I am very surprised at the increased value to bombers and their affect on the enemy unit (being able to kill them). Since Civ2 Test of Time the bombers and fighers have been pretty much useless. However there is still a problem of aireal combat. The system was adequate in civ2TOT where bombers were left in midair in the middle of turns and fighters could attack them, it would be nice to bring that back. Without that factor fighters are pretty much useless, especially considering that there is now flak.
Corruption is a huge problem but I believe it sets a realistic contraint on the game, not allowing larger civilizations to take complete advantage of the world. If you have 200 cities and they all have low corruption, this game will not be fun. Simply build strategic Forbidden Palace OR move your palace to a newly conquered land if it's resourceful.
The resources should be a little more abondant, as should luxuries.
There should be a unit step between Knights and Cavalry (as it was in TOT, Dragoons), also the original Phalanx and Legion were very good, no idea why they are gone now.
I am upset about one thing. Where are the Hebrews? It was once a one of the greatest and most prosperous early civilizations (Solomon, David until the Roman War), where Jerusalem was up to 2 million dwellers. The Jewish history is one of the most important in tales of Epic, suffering and victory and its missing. Their wars with phonecians, egyptians, babylonians, assyrians, greeks, romans, crusaders, spanish, german, polish, russian and most recently Arab instigators are known to ALL, where some of the latest Civs in CIV3Conquests are barely known.