My success against the AI is kind of spotty.
I can beat any level of AI all the time playing a certain way - but I don't find that fun. The way I would play would revolve around relatively early rushing and commander sniping. This, to me, really diminshes what I love about the game: long drawn out wars of attrition. When I get into level three, 1v1, it can get kinda tough (the AI will pretty much always outproduce you as they have infinite micromanagement capacity).
We played a 4v4 last night that lasted for about 1.25 hours and it was soooooo fun. We could have had it over in about 20 minutes by one person pumping out broadswords by the dozen, another scouting to find the commander, and the other two playing defense. To me, this isn't that fun.
That being said - the AI (esp on certain maps) has general pathing issues. It's much better than TA, but still - they will continue to send wave after wave of attack over pretty much the same path and rarely look for an alternative.
We will start playing against one another - just for now a couple of us are pretty new and it would be hard to make teams that are fair.