I came from IV, which I adored, so I was skeptical about VI. But I bought it, and I had a lot of fun with it. Many of the new things work well together. Many of the perceived "flaws" of VI work perfectly fine for me, and others don't bother my experience too much. But the AI not upgrading its units - if it is not fixed - will be the reason for me to not play this game anymore. On Immortal, as soon as I reach the techs for Crossbows and Knights, I have as good as won because I'm fighting mostly Archers, Spearmen and Warriors even though the AI is already in the Renaissance or Industrial era. This is not a challenge at all. Why would I compete for military techs with the AI if they don't get the new units anyway? Why would I try to keep them from attacking through diplomacy if their outdated units will never take my cities anyway? What fun is there in winning battles against Warriors and Slingers in the Industrial era? This one thing breaks the game; and it was known before release (see developers' comments during Battle Royale); and it should be somewhat easy to fix. So please do it, Firaxis.