I guess Civ V is good for newbies and beginners to the series... most of the people who play civ already since the very first beginnings or at least since civ III, have returned to Civ IV and enjoy it because of the fantastic mods and modmods that have been created by the large community there. I myself bought civ when it has been released (if I wouldn't earn good money I would still complain about that
) and tested it for a week, experienced it as "terrible" because of all its flaws, bugs and not working concepts (dumb AI, broken diplomacy) and waited a couple of month, while I played Wildmana and Master of Mana (civ iv modmods of FFH 2) and tested it then again. I have to admit that they worked on the game and improved it, but it is imho still no delight for me as a deity-level player. It is utterly boring and makes me angry. So I will wait since they don't let me feel like having purchased a game that is still in its' beta phase and am glad to have discovered PAE IV for civ iv. In the meantime I will stick to civ iv and it's mods which made the vanilla game so great. I hope Civ V will learn from this and integrate the modding comunity more into its' concept - though I doubt this. Buying new civs and other rubbish via steam is one of their most important cash-flow-concept. BTW, I hate this and steam.
Moderator Action: This is the Civ5 forum. If you only want to talk about Civ4, then please post in the Civ4 forums, and not in Civ5.
The 1upt is sth I quite liked, though not all of it, but the tactics behind it. Thouth there would have been another approach to it with genereal unit hard caps, hard cap on units stacking in an SOD and other promotions paths + hero promotions to make units more individual and engage therefore more into role playing and tactics. And civ iv modmods had this all... right there, for free.
If you are interested in good civ-iv-mods:
www.masterofmana.com
http://forums.civfanatics.com/showthread.php?t=352646