I just ended the first round of the campaign on the easy mode.
Rolled the enemy on every of the maps big way, which think its positive as it was the easiest mode.
Not sure if it would be possible, but would be good to have a chart, with saved data showing at least the information of the scenarios that a player is goign through, result on them, what was the followed path, expend and won prestige, units lost / gained, units receiving mentions, composition of the army on every scenario, etc.
It would give the players a base to know from where to where he is going and how he is doing, comparing with other games and maybe with other players (?)
As idea for units pocketed, maybe reinforcements should be disabled, and reammo made only available around the airfields. (too complex?)
I was gratefuly surprised of seen the Balcans, Greek and Creta at start

If DLC campaing gonna go ahead, would recommend also give more options for the game: like not losing units (killed units appear again next scenario with 1 strenght), or not counting the turns, so some players could play in hard mode but with all the time they want to, so they can follow the campaign agaisnt all the strenght of the enemy.
Maybe also info about what means every of the difficult levels would be appreciated. Selecting field marshall can show a text below saying "you will start with x units with 1 start experience, enemy will have this and that, and IA will be aggresive plus harder units to kill...)
At least to have an impression of what you are chosing.
Overall excellent campaign
