Pretty Good and more of the same to keep the existing fans happy but still nothing to attract new players . . .
Unfortunately this has meant that whatever changes in the game-play are made will never be significant enough. Don't fix it if it's not broken.
A fancy new interface and pretty new graphics but its still Civ underneath it all.
Still highly addictive and at times complex.
It would seem that an effort has been made to dumb things down a bit to accommodate for new players, but Civ 4 is still pretty much an intimidating animal that will keep old Civ players very much hooked to Civ 4.
The rest ? The new players?Well . . . all that turn-based stuff is boring . . will be the standard response cause lets face it if its not your cup of tea then what aspect of the overall game will make you think otherwise?