I would have rather it affected the amount of time required to tech up than just make units/buildings cost more. Fast teching has always been an issue with all of them except CIV I. The timeline was better in CIV I, heck I remember having numerous wars with my legions and chariots, now ever since II it seems they last about 5 minutes and someone player/ai is at gunpowder. There's no wargame anymore in the early game hardly ever. Oh the occassional skirmish and then a few turns later the peace offering. But, not the full blown wars like in CIV I.
And yes I know this game has always war option, but, the problem now with this one is they took away fast settlers, I can barely get 5 settlements before the map is covered, but, I do play with 15 civs. I could gets 10 to 20 settlements in CIV III and plenty in CIV II as well, but, not near as many as in CIV III.
This is what's hard the constant changing of this and that, instead of adding to and leaving what was already working alone. Playing with 15 civs in CIV IV is simplyboring, not near the fun that CIV III offered, even if there wasn't a lot of warfare, there was a lot of other things going on.