Just started playing Sid Meier's Civilization: Beyond Earth. I bought it when it first came out but put off playing it until I finished Wolfenstein: The New Order and Saints Row: Gat out of Hell.
It's basically an updated version of one of my favorite games of all time, Sid Meier's Alpha Centauri. The graphics are really nice and the interface takes a little getting used to. For instance, you can't reassign keys and some of the key bindings are awkward. F11 to quicksave Ctrl-F11 to quickload ("Whoops I wanted to quickload, not quicksave!")
-420
I bought it because a friend of mine basically forced me into it (i lost a bet and owed him the game) so I got two copies when it was 50% off. Anyway. It's very similar to Civ 5 mechanics wise. The biggest difference is the Tech Tree being replaced by a Tech Web. Otherwise quite similar.
The issue with the Civs games is that it makes more sense to wait for expansions because they always improve the base game by A LOT. So I'm not playing Beyond Earth yet..Civ 5 is a better game as it stands now.