Prior to the first day at Gettysburg, it's somewhat unusual to find any element of the Army of Northern Virginia in a meeting engagement. First Winchester, Cross Keys, Cedar Mountain and (possibly) Frazier's Farm are examples of engagements which occured while both armies were on the march. Note that Jackson was in command during all but Frazier's Farm and (of course) Gettysburg. In a meeting engagement, plans have to be made on the spot, which makes leadership even more important than ever.
In each of his engagements Jackson had a reasonably clear understanding of his opponent's strength and the ground on which he would fight. In contrast, Longstreet and A P Hill knew little about what faced them at Frazier's Farm. The same is true for Lee at Gettysburg. Lack of accurate information on which to base decisions may help explain poor results in those battles.