We're in Beta, and the AI isn't even finished yet. They're probably tuning the AI using player vs. player data.
I'm not great enough to 1 v 1 Insane AIs, or rather I don't feel like it. But in 2 v 2 with all Insanes and me? A right army combination, devastators with zeppelin support, unit abilities and forcing chunks of their army to go after you at a time followed by a full dragon supported assault leaves me winning with manageable casualties all the time.
