The game is buggy as all hell. It's got way too many missing features - the civilopedia needs work, which you can't even access from the main menu (which is also lacking compared to Civ4), there's no movie for winning, there's tons of mislabeled / undocumented stuff everywhere, the multiplayer seems barely functional, etc etc...
Basically, it's an incomplete game, screaming low(er) budget (a far cry from Civ IV, at least when I bought it).
However, the core gameplay is completely awesome. I freakin love the new battles (1 unit per tile and ranged attacks are awesome), and the choices you are given (social policies, city states). In time, with patches fixing most of the technical (and balance) issues, it'll easily be stand among my favorite Civs. I can't stop playing it as is, dumped way too many hours on it already
