I have Civ5 & BNW, still trash. I bought Civ4 at release, pre-ordered, I think. And it was light years ahead of Civ5 was at launch, which I also pre-ordered. Civ5 comes in the age of micro transactions and cutting features for DLC.
Unlike waterjug though, I despite 1UPT. That needs to be scrapped in Civ6, at least given the option to turn off. It was so tedious moving armies in Civ5 because they all had to be moved individually. And the game's crippling pacing problems, you'd have researched new units before you'd even gotten the first group into combat. Ie, in the time it takes to build a single musketman, you've researched rifling. By the time you get your musketmen moved into enemy territory or an attacking position, you've built several riflemen.
Was going to ask about the expansion packs, sounds like we both are looking for something similar in a strat. game. I think maybe having 3 or 4 units per tile would be nice.