Well, they had a free weekend once and in the very first mission I thought "let's see what's around this corner". There were no aliens, the landscape was pretty, but it meant I lost 2 turns and the mission. I promptly uninstalled it and bought it a couple years later when it was 90% off. Never bought any expansion.

Maybe you like crap like that but I find it insulting. See my other answer for how to push players to move fast without introducing arbitrary limits.