We played co-op 3 times (1 two player and 2 thre player games) and won very easily. (full co-op) Even moreso, I think that in the end I could have conquered the last city (level 11) by myself. Did anyone else have the same experience with co-op?
I'm looking at turning up the city levels, yeah. Even with flailing and some suboptimal play, we were easily able to take the last city in a 3p. I definitely feel like upping the cities would slow us down enough to make it much closer. I just don't know where that level is yet.