Monkey-interns at work again, blindly typing harder than ever.
Scenario 1: Does the Messenger just need to make it into the enemy deployment zone, or be alive at the end of the game in the enemy deployment zone? Because in the former case with Dawn of War Top of Turn 1, put the messenger on the deployment line and step forward... And any scenario in which specific armies need to be called out (and misspelled!) probably isn't a good one.
Scenario 2: One objective, most Troop choices within 6" wins. This is the best of the three scenarios, like saying syphilis is the best STD. This would have been better with three objectives evenly spaced along the midline. For now, prepare to get your Tank Shock on!
Scenario 3: Really, random mission? Players spend two turns attacking without knowing why. These games will start slowly, and there will be games where players bemoan, "If I knew what the objective was, I would have played differently." Yeah, that's the fairest way to determine who wins a 2500 point army and who moves onto the finals.