Above 30 is historically great. Above 25 is great. 20 is very good. 15 is good. 10 is the bottom rung of average. 9 or lower really sucks
Take the 6 NBA Finals game scores for each major guy (as reported on basketball-reference.com) and divide by 6.
Bosh - 14.41
Leonard - 14.05
Duncan - 15
Taking the median (rather than the average) of each guy, the numbers are roughly the same for James, Parker, Bosh, Green and Leonard (Wade goes down to 13, Duncan goes up to almost 16 and Ginobili drops to an almost unimaginable 3).
So, analyzing only the Finals and using only this stat, you would go with James or Duncan as MVP. I still prefer the Kawhi Leonard take.....so shhhhhhhhh.....