Campaign Game - All 28 turns
Barbarossa - Axis Game turn 1 to End of Game turn 5: 5 turns?
Fall Brau - Axis Game turn 7 to End of game Turn 10: 4 turns?
Operation Saturn - Soviet Game Turn 10 to End of game turn 13: 4 turns?
Citadel - Axis Game turn 14 to End of Game turn 19: 6 turns?
Operation Bagration - Soviet Game turn 19 to End of Game turn 22: 4 turns?
Na Berlin! - Soviet Game turn 23 to End of game turn 28: 7 turns?
Are those accurate?
Yes, that is correct, although you could regard the Operation Saturn scenario as only 3.5 turns since the Soviets move first.
So, is Barbarossa the best intro scenario to this game?
Personally I would just get cracking with the full campaign to get the feel of this game.