There's nothing wrong with Civ 5.
Well, there are a few things wrong with Civ 5, but I forgive it because I will do anything to get away from stacks of doom, which were always by far my least favorite part of any Civ game.
Today I learned that, for some reason, X-COM isn't called that outside of North America. Even they should call it X-COM, though, given that all the other games in the series related to it are called that.
The new X-COM game is reasonably good also, except for the CONSTANT game-crippling bugs.