Invertus

While i do admit that Civ V vannila was,,, underwhelming, Civ V:BNW Completely fixes all the problems that plagued the original. better AI, Expanded Diplomacy, Trade routes are hella fun, MUCH better late-game with ideologies (and Xcom cause why not). Overall, if you ever doubted that Civ V was awesome-tastic, pick this one up, it's tottaly worth it. Civ V:BNW-Best Civ to date.