I used to buy many games in the past as soon as they were released, primarily for their multi-player parts. Rarely would I consider the AI because I tended to believe AI is hard-code logic without variations, one could anticipate their next move. (In fact, the Random Personalities is a good implementation to remove expected trait). This observation of mine applies to virtually any game with a Single and Multi player components. And then, I seldom played the Single player sorties.
But as time goes by, my interest drops. Having said that, the great trend towards mobile platforms is also attributed to my unwillingness to buy new titles. As a result of that, I spend less on games, and my budget to buy games changed dramatically from several hundreds to just below hundred each year now. To me, CIV 6 costs me just less than a hundred dollars, and I consider paying for a computerized board game, Unless my expectations are wrongly set which I believe is not, I find my decision to buy it the day when it was released is nothing more than correct.
If you look back to the history of CIV 5, when it first came out, lots and lots of negative feedbacks which after so many years now, those feedbacks are proved to be unnecessary and some are even wrong. The people on the forum then speculated and whined about this and that. I still recall people complaining about the fog of war and the presentation of the map being too artistic! In retrospect, the fog of war represented by clouds is conceptually relevant to the idea of "God Simulation". These complaints just showed that they are childish and unable to adapt to changes, real changes.
The outfit of CIV 6 is another real changes, not to mention the core, otherwise, no existing fans will be interested in buying it. About the AI, no AI is perfect. As someone has pointed out before, unless a giant AI engine is deployed, otherwise, the AI won't satisfy the whole population of gamers. But doing so, the game will demand huge resources from the CPU and each turn may take long long time to hop from one to another. So I excuse that also. In CIV 6, the CPU gets as hot as it does in CIV 5, so I take it in, no complaints. All I concern about is the fun I can get out from it.
If one waits, it takes a long time to get something like BNW, but will you feel it's like 'End of the World' without an expansion like BNW? I don't and again I dont see the necessity to wait! I can find the joy in the game in its current state very well! Just exploring its very new features, and finding the different combinations and the RPG like elements in the game itself may take you more than a few months, in fact. At least, this happens to me. I have plenty of time when I am on leave and having a cup of good English Tea with Scottish Shortbread while playing the game in a Cafe is quality of life! Other times, I go flashing some custom ROMs to my old smartphone, or chatting with my friends on facebooks...enjoying life.
Why wait? Make good use of the time to get to know the new game playing style and enjoy the fun while the developers make new improvements. Play it casually takes just a few hours and your attitude affects your disappointing the game. Try to play it well is not easy at all. For example, move your first settler to other tiles at the beginning and the outcomes will be entirely different. In fact, the developers need our feedbacks too. So get it now and let us know what you like and what you don't like. The game is out, that's a fact and cannot be reversed anyway and more importantly, it is a good game, very good game in fact! And stop complaining, people complain things like a habit one of these days, get rid of this bad habit please and that is for your own good after all.