I think a little of both myself. For example I enjoy taking control of the land units during a campaign. But would like to see the air and navy controlled by the AI. The ability to pick and choose what you wish the AI to control would be nice. But when playing as Germany you almost have to have the AI manage your war with USSR, just do to the sheer numbers.
I also don't like it when the AI moves troops back from the front line to reorg leaving a gaping hole there at the front. So often you see a hard fought battle for a province and both sides retreating after the battle... instead of digging in and reorganizing there.