I'd like to jump in and mention that I completely disagree with the many people who say they want simpler, more standard traits on civs...
The magic of Civilization are twofold, for me... The "Just another turn" feel and more importantly, the replayability of the game.
Replayability, for
ME, comes mainly from the different flavors that can be added from one civ to another. I've played and won with every civ and leader, and then have gone on to play at least another 20/30 modded civs. And it's what keeps me playing after over 3500h of play... NOT boring challenges
The problem comes NOT from the many configurable attributes that can be used to define each civ... It comes from not being ingenious enough to make the differences significant, and going for traits that are just plain stupid
like those related to being DOWed for example.
Diminish these options that make each civ flavorful, and what you'll get is yet another nice little game that after 5 or 6 games I wont feel like playing again...
SO... Keep the complexity and flavour in civ creation, FXS, please ;-)