I have been playing at intelligent and I too see the same AI problems. If the devs can improve this then the AI will be much tougher overall without complex analysis of game play or major coding. I will summarize again what I have seen myself and what has been mentioned above:
- High quality planets are vastly underutilised overall even very late game in a Gigantic galaxy on intelligent.
Note: Above intelligent level AI is not improved the AI just gets eco, manufaturing, diplo bonuses etc.... at least in GC1 its like this.
- The AI seems to choose randomly which squares to build which i thnk leads to stupid stuff like moral improvement on a farm square and vice versa.
- Culture improvements are too highly favoured especially on minors...
- Building the superprojects or captial improvements on level 5 planets or less is a huge handicap for the AI, especially as they are already not using the free squares on their beytter planets.
I hope these issues get fixed fairly soon as this for me is the biggest AI fault area at the moment. I think the devs will fix this son though since they have been very reacative so far
Another area where I hope the AI gets better is:
-Better population management: - They send out troop carriers leaving some planets with just a few billion.
-They build expensive planetary defenses (OK) , but then leave it defended by one low powered ship!!
- When a planet gets attacked they build a weak ship afterwards, even if an armada is on their dorrstep... harder to code this I suppose...
- When you donate a small fleet to a friendly AI they, dont fleet it themselves, leaving it much weaker. They also dont attak any easy targets close to the location you gave them the ships.
- The AI builds several unimproved starbases eg eco, culture instead of fewer starbases but improving them.
GCII AI was adverstised as improved, but this is not yet the case. I hope other players will start to comment more on the AI weakpoints to ensure the devs push the AI enhancement up their priority list.