Civ 4 was very disappointing for me.
I gave Civ 2 MPGE a 10 (Loved it, recommended it to my friends)
I gave Civ 3 a 10 (Loved it, recommended it to my friends)
I gave Civ 3 Conquests a 10 (Loved it, recommended it to my friends)
I gave Civ 4 a 5 out of 10 (It was ok....different than expected (TOO MUCH HYPE / Propaganda) I would not recommend it to my friends)
I quickly got bored of Civ 4 games and then moved on to the Scenarios....I actually liked the American Revolution Scenario better than the regular Civ 4 games. The Civics were interesting, but got old fast. I did not like the fact that they replace the Attack/Defense Stats with a (Single Power Stat).
In my opinion, all hope is not lost for Civ 4....with all the expansions (i have only played the Original Civ 4) their may yet be hope for it.
I would MUCH Rather play Age of Empires 3 than Civ 4.
I would play Civ 3 Conquests = Age of Empires 3
I have not played Civ 4 for quite some time now. It is possible it has improved since i've played it last (ie. Updates/ Expansions), but I'de rather save my money until they Come out with some sort of CIV 4 Complete before I spend another dollar on Civ 4....
Civ 4 is good in its own right.... but it was not an improvement on what at the time was the best of the best (C3C).