My expectation was that this will be the best game ever (until SMAC 2 or Civ 4).
I was not disappointed. The game retains most of what makes the series great, yet at the same time introduced a lot of new ideas and fixed a lot of the more irratating parts of civ and civ 2.
I love the improved graphics, borders, new maintanence system for units, resources and trade, diplomacy, much better AI, culture, civ specific units and traits, improved ability to edit game rules, reduced usefulness of spies (I hate them), bombardment, armies and leaders, the way research works (I can now research all techs I can research), small wonders, barbarian camps, and a lot more.
I don't like the changes made to terraforming (essentially they removed it) and the way great wonders are built (essentially no more rush build). But I understand these are done for play balance and actually make the game more challenging.
I really don't like how corruption is done in this game. Corruption was too weak in civ 2. There should be more penalties for building a vast empire, that I agree. But its simply way overdone here.
I can't intercept enemy bombers with fighters, that's another major problem. But I'm sure it'll be fixed in patch.
There are a few things more. Like a better scenario editor, more options for us, like the ability to make custom civs in game, make civil disorders a pop up warning, the option to continuously build military units until told otherwise, single click access to screens, etc. But these are fixable and are minor.
It can be a little more polished. But its a solid game and I am not disappointed