Surprises are good. New models of enemy planes showing up without warning. Targets of opportunity presenting themselves on the way to or from a patrol area. Going after a flight of bombers and getting bounced by their escorts.
One thing I hate in some campaign is always entering a fight at a clear disadvantage or on even terms. Those things happen...but shouldn't the advantage be on the player's side sometimes too?
Other surprises that lead to important judgment decisions center around coming into contact with additional enemy flights after the "main battle" in a mission. especially if you are leading your flight, you have to decided if fuel and ammo make another fight possible or if discretion is the better part of valor....and running if you can
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In one of the best campaigns I have flown, the first few missions were training type missions. For newer players, those missions would have been very informative. For veterans, you are forced to fly aircraft that you would not normally pick.
Those are the things that seem to make a campaign memorable to me. Most of the things that I remember are "different" types of kills or surprise snap shots which I am not sure one could set up in a campaign....they just sort of happen.
Splitter