So far the game plays fairly well. The AI has flaws, and I will list the ones I have seen, but it does fight decently when it gets it right.
1) Cooperation between allies; as Russia I invaded France via Morroco and the nation north of holland. I crushed the garrison protecting the french fleet, but the french ran the blockade and retreated south. While the brits went last and returned home to replenish the fleets, then first next phase to return and prevent french movement, at no point did the brits, with a stack of corps at home and fleets in port, send me any help. After several months, I was so reduced I had to flee.
2) Appropriate aggression; when I seized the minor north of Holland, and then holland, the french came and after a few battles, chased me from holland. I retreated north and because I had a ton of infantry to reinforce in, stayed around for several more months. I got the attention of the french army and they came in force, again forceing me to flee, but once I fled, those french armies just sat there and did not take out the conq minor I was using to supply myself and invade from. They also never tried to cut my supply off, and this fight lasted long enough that I rebuilt my guard corp twice and brought in 5 fresh cav plus numerous infantry. Also, single corps or 100% infantry should not be thrown at large advancing armies. This tactic may be worth it with a small corp of militia or infantry to see what is coming (and the AI should remember what is coming as well as a human who can see clearly if an enemy is in range of supply, thus knowing if the numbers might change) or even as a delaying tactic if such a manuever would allow a better army to arrive in defense.
3) Appropriate defensive posture; Paris was left wide open with 1I for garrison, allowing me to sneak in a single corp and tackle the city in an eco phase, winning me (to my incredible surprise) a conditional from france. I had a fleet with a 10I corp sitting in Morroco, the very corp I used to take the minor with (the cav corp left to join the rest of the army), so it would be reasonable for the french AI to know what was there and were it could reach, while almost the entire french army was north in the german states and prussia, fighting russia and prussia. Since paris can be reached via naval invasion in two rounds, the AI should defend paris with enough force to repel any invasion force in range wjen its corps are out of range, even for a double move.
...nothing is more chaotic than a battle won...