Well, I'm very encouraged that there was a 'large' attack in the test scenario I ran (5 posts above this one).
It's difficult to set things up to test my gut feelings (that not enough happens) when (a) there's FOW, (b) there are genuine tactical considerations to contend with.
BUT. It's the most sophisticated AI (friendly and enemy) out there and so, my feeling is that it's designed to try to imitate reality - at least that's what Dave is trying to do.
So, it SHOULD be possible, with the Kursk scenario I did, for example (and only as an example), to have the soviet side with overwhelming numbers in men and materiel (as in reality), but with their quality overall poor, and the Axis side with a much, much smaller but higher quality force, and the actual historical objectives set, and the AI will very roughly, then, do what the individual sides did in reality. But right now that just doesn't happen.
Or, with Beda Fomm (to take another example) it should be possible to have an overwhelming superiority in men and materiel, of a generally poor quality (the Italians) contested by a much smaller force of higher quality (the Allies), with the actual historical objectives set (exit points) and the result to be that the AI can do what the Italians did - put up a brutal fight. The Allies won, but it was close and brutal. The stock scenario is roughly set up along these lines and what happens appears to be that the AI as Axis becomes crippled and unresponsive.
That is also what happened when I set up the Kursk scenario along historical lines. To get different results the stats for the AI side had to be maxed out and a lot of thought put into trying to script attacks through the back door, as it were, by clever placement of objectives.
I think that this kind of sleepy AI is also what I have seen (and posted about) in, for instance, Maas-Rijn (where it should be possible to have the Axis (as AI) completely crush the paras in Arnhem (if the player just sits back, at any rate), but where what you end up seeing is masses of Axis forces surrounding the paras and then never using their strength to mount effective, strong, coordinated attacks at, say Regimental level. There are attacks, but they're too small to make a diff.
I saw this also in Spearhead v Reich, where, on surrender (and at the end) there were huge assemblies of Axis forces that were just not doing anything.
So that's what leads to my gut feeling that something might need tweaking.