Happy bday! I too have been immensely enjoying my current 1.07 game on fractal / deity - so many wars going on, so many decisions to make every turn, absolutely loving it! (fractal SO much better than continents guys)
Settler AI is great. Combat AI is good (phenomonal vs vanilla of course) with these two being the top weaknesses IMO:
1. Bad at using commanders. Usually they arrive at the battlefield separated, unpacked, very easy to single out and eliminate in the first turn of battle, especially given they can't even fight back. I was afraid this would happen becasue every time Firaxis introduces a new concept into the code, it takes them several patches to then go and actually teach the AI how to use it. Same story over and over for the past twenty years... I am assuming that is all locked in DLL and you can't improve?
2. Gives away their BEST cities way too easily: (correction - diplomacy AI, not combat AI) Even though they claimed to have toned this down in their first or second patch, AI still does this. I wouldn't worry if they were giving away peanut towns but no the issue is very severe. I just gained two capitals with 3 wonders each in peace deals where the AI still had a fighting army (I was actually going to propose peace myself). This is SO impactful that it feels like cheating almost, but I'm not the type to enjoy a game by introducing artifical rules on myself (e.g. "don't take cities in peace deals"), so I take the cities. Again, assuming this too is locked in DLL and you can't improve?
Keep up the great work, look forward to next version!