[offsides]

Based on my playthroughs, the #1 thing that I would suggest looking at is whether the AI takes into account both its own objectives AND its opponents, or just its own (and how they're weighted). Because even if its own objectives are heavily weighted, if preventing its opponents objectives are not equally weighted you get what we're seeing. In each scenario there's effectively 2 sets of objectives running in parallel - you need to reach your goal, while at the same time preventing your opponent from reaching their goal. The AI seems to be focused entirely on the former, and doesn't really pay attention to the latter...

Also, in skirmish games where the AI plays the defense, there doesn't seem to be any attempt to conserve and/or concentrate forces for maximum effect. This makes it easy to pick off individual units without much risk to the Ogre, eventually rendering the defense toothless...