The Civics, I enjoyed changing the structure of my government and society.
The maturing plots of land, I enjoyed watching my cottages turn to villages, towns and then cities and seeing their wealth grow…and really liked when some punk pissed me off so I’d go a plunderin’.
Luxury resources should be a bonus, but they shouldn’t be absolutely necessary for a civilization. It seems every city you found in Civ V MUST be surrounded by 6 luxury items or that towns a waste. The Russian Empire did just fine with some beaver pelts.
Roads, criss-crossing your empire with infrastructure was fun, in Civ V I’m only able to maintain an anemic artery even in the late game.
Scale, I love historical scenarios and the first 4 civs were flexible in scale. Depending on the size of the map of Earth England might be 4 squares or 30. The tactical combat in Civ V restricts this severely.
Religion, sure IV wasn’t perfect and I think the team decided it was detracting from the game elements they wanted players to focus on, but still, waging Crusades or Jihads was fun.
Troop management/movement, getting an army from point A to point B is just a pain in the ass in V.
Modding, creating and trying out what others created was a big part of the draw, V has a more developed mod program but theres an initial steep learning curve that few (including myself) are willing to undertake.
Am I the only one forced to watch half that damn opening movie before the game will start?
I should add there are some things I really like about Civ V, but it’s still just not as much fun as IV.