Martinus
Emperor
Yeah, this sounds about right to me. Expansion should mean sacrificing science or culture or faith or whatever in the short-term, but ultimately a big empire should be better.
I also think that roughly half-way, maybe two-thirds of the way through the game, the map should be just about filled up (excepting a few marginal deserts and polar regions). Civ V with its unclaimed land deep into the Information Age just didn't work for me.
That's just simply not true. There are large parts of the world right now which are either uninhabited or inhabited very sparsely (in a way not justifying a Civ city) - Artics and Antarctics, much of Australia, a lot of Africa, Amazonia, big parts of Siberia and Canada, etc.