Yeah, it is a bit confusing. Besides the standard victory conditions, like in Key positions, the basic scoring is 1 point for every unit destroyed. tally up how many of each sides squads were destroyed and compare the results. A 0-1 point difference is a draw, a 2 point difference is a minor victory or minor loss, a more than 2 point difference is a clear Winner or a clear loss.
So, in my game yesterday,U.S. Airborne vs Italians in Demolition, I won by destroying my opponents base, so scoring is thus; He destroyed 2 of my squads (Bazooka Team, Light Mortar Team) so he gets two points. I achieved the objective, and destroyed 5 out of 6 of his units as well. So I had 5 points and a mission win. ratio is 5-2 I therefore have achieved a clear win. For the league then, scoring is thus; I have a Major Win (4 points), no need for a tiebreaker based on destroyed units so thats done. MVP is decided between players, we didn't have any real outstanding units going rambo across the table so nothing there. Logistics scoring started yesterday so the only scoring would be for theme, and best painted. Theme you're only going to get once, painted is by Army every three weeks.