Soren Johnson's talk regarding Civ IV AI (
http://www.youtube.com/watch?v=IJcuQQ1eWWI), in which he distinguishes between "good" and "fun" AI personality types.
Sorry, but Soren's opinion on this completely sucks. In a balanced game, an AI that plays well *is* fun. You don't create an idiotic AI then heap bonuses on it and pidgeon hole the player and call that "fun". That's called "lazy". Nice try though, Soren.
kmod AI is a lot better than standard and I would use it nearly exclusively if it become popular here in S&T. It runs BBAI in there with some improvements.
Stock AI: 1 Victory condition it can plan (and bts only), and it does it poorly.
Kmod/BBAI: AI can and will attempt to win using any of the major victory conditions, depending on flavor and position.
In other words, in one game you have actual opponents, and in the other you have pathetic walls of bonuses that don't actually try to win. I'm supposed to buy that the latter is "more fun"? How so? Just because deity in bts doesn't completely drain away viable strategies doesn't mean that it's ideal. Stronger-playing AI is always better, with the only caveat being that doing so in a poorly designed game will expose imbalances.
Imbalances, such as speed teching renaissance. Prior to rifles/cavarly/cuirassers, there exists exactly 0 units that are not countered or defended by a previous era unit (excepting the very first units, because there is nothing before them at all). Even the questionable noobiphants are cost-ineffective against spears.
But failaxis, instead of addressing this while tweaking the AI, instead decided to simply hike AI bonuses, further emphasizing the importance of a single strat. They have a long history of taking things away rather than tweaking the AI to play better. Look at their disgrace behavior with overflow --->

bug in their FINAL patch (where they even admitted an unintended consequence...then NEVER FIXED IT!). How about when they bugged espionage spread culture just to switch it back?
When it comes to game quality and post-release support, Firaxis = EA. Soren's is one of a list of names that have contributed to that reality.
There were better user interfaces by 1995 than either of the last 2 civ games, too, but that's another matter entirely and kmod even helps fix the broken controls that failaxis never managed

.