Many of us have never finished a game of Civ (in any of its forms), or almost never. There are a two inevitable things that end my interest in a game. One is when all of the world is filled up with urban sprawl (sort of like the LA area) and there is no wilderness left, not a spot of undeveloped land. The barb and animal boosts in Orbis have gone some way in addressing the urban sprawl problem. At least it is a little bit of a struggle to cover every square inch with strip malls and Walmarts. However, Id be much happier if this never happened, since it seems unfitting in a fantasy setting. A bigger problem for me is discovering and mapping the whole world much much too early. Surely there should be large patches unknown even in late game (as there are even today in the Amazon). In early game, my knowledge of the world should be really limited (like what the ancient Greeks knew about China). Instead, I pretty much have full NASA satellite coverage of the whole world soon after Tracking. Yes, I really hate those birds, or at least their ability to do round-the-globe city tours like some ultra-rich college kid. That and map trading at Cartography, where you dont even need to go anywhere. I also think it should be much more rare (rather than common) for a little sailing boat (let alone a fishing boat) to circumnavigate a whole continent.