Good!? All they use is melee units. No match for 15 or 20 Hero Fanatics! (they don't even have to be heroes). As for archers, well the offshore siege ships make quick work of that!
That's on easy though. But still, the AI isn't THAT good, even on lower difficulties.
Now, a hard AI to beat would be the Easiest AI in Empire Earth II: Art of Supremacy. You'd be sitting there twiddling your thumbs, next thing you konw, bad guys unload on your shores, they get beaten and while you're trying to research all techs, BAM they've advanced to the next age. In the vanilla game, they'd sit in primitive ages and take forever to age up. In the expansion, the AI just got better, which is bad for a pansy like me!
Back to Age of Mythology: I like to play as Gaia or Isis, or Hades. I don't like to play as the Norse
Maybe I'm playing the wrong game because I see the AI build plenty of ranged units. Like I said, if I decide to spam melee units, all of a sudden a load of toxotes show up at my base. They build counters so it's not fair to say they build just melee units. That is what makes this AI different from other AIs. Other RTS's AIs build a mixed squad all the time. They don't tailor their army to counter whatever you're building like the AOM AI. From what you wrote about EE2, it's a different kind of "better AI". That AI techs fast and yes, that does lend itself to providing a good butt-kicking. I'm just saying that the AOM AI has a different style of playing well.
As for civs, I actually like Norse because of their resource model and the ulfsark (sp?) for forward building. Battering Ram is also very fun. For myth units, Hekagigantes is my favorite.