I think the very building blocks of the whole civ series (the food, shields, commerce, %science rate, gold etc) are both a blessing and a curse. It has provided a great building block for the rest of the game's features which have gotten progressively more complex going through the series but then it also causes a limitation on what you can actually do in the the game.
I think this is the kind of thing that Veralse (lol @ Jonny Vegas comment btw

) is getting at.
what I would really love to see introduced in the Civ series is the ability to choose your
level of complexity.
Being able to pick what victory conditions you want to allow, whether to have nasty barbarians etc, is all well and good, but I want to be able to choose how complicated a game I want.
The problem that Firaxis have is that they are producing a game for mass-market and therefore it needs to be readily accessible for the proverbial "casual gamer". This puts a limit on how advanced game concepts can get as they still need to be
playable
Wherease people like myself, and I'm sure many others on these forums would be quite happy to compromise a little on the accessibility front for a little more complexity (and therefore STRATEGIC play options!). but Firaxis can't do this for fear of losing 'casual gamers' behind.
I for one would love a more realistic and complicated political, economic and social model included in the game. But this would require a degree of complexity that might put off many people. With some sound planning such features can be added using the basic building blocks of Civ but done in such a way that a 'casual player' could just tick a box to NOT play with such features included.
I also loved the public works feature of CtPII and would love the option to choose whether to play with this version instead of workers. I'm sure it could be done. rather than ditching workers altogether you can choose whether you want to have them or public works.
rather than Civ being 'broken' I thinks it very nature is it's greatest strength, as it provides a platform that can be modded, adjusted and tweaked to do almost anything - tell me of a similar game that has such flexibility at it's core?