TBH the way CIV games have gone, needing expac's to make the game good, you'd probably be better waiting for the game of the year edition with all dlc/expac's and a steam sale
Tried 6 a few times, daft as heck and the AI doesn't play by the same rules, I swear, went back to 5 and am enjoying myself loads. In for a cultural with Brazil, having a science as a back up too. It's so good keeping all great peeps and pop them all at once and seeing those numbers skyrocket during a golden age