Well..in the beginning, I thought they were rather cool, and would embed them in my front line divisions as support units.
Now, I find it is better to not have them as support, but rather, as a unit behind the battle. Put on reserve. As a brigade, they have a fairly good chance of joining the battle anyways.
And you can always fill the division with other support units. Like Engineers.
You can give them good mobility by scooping them up with an HQ, then sending them off to another front via change HQ command. Bring a bunch to shore in an HQ then dump them all out as units.
“My logisticians are a humorless lot … they know if my campaign fails, they are the first ones I will slay.” – Alexander the Great