Well a lot of power ranking used in the real nfl take points allowed into account but you can't really do that in a fantasy leauge since you can do nothing to stop your oppenent from scoring. So my "Power Ranking" is based solely on the the total winning percentage of you team if you had played every team every week.
For example, in my league there are 12 teams so each week I will compare your score to the 11 other teams and create a win-loss-tie record based on that. Then do that for each week. So after week 3 my team is 10-23 (33 total match ups), that puts me ranked 9th in the power rankings. Not to good.
But, my acutal record is 3-0. This is where the luck factor comes into play. I take my real winning percentage, 1.000 and subtract my power ranking winning percentage 10-23(.303). That give me a +.697. No one in my league is even close to that. Teams that are under acheiveing, meaning they score lots of points but get beat by other people that scored a lot, will have negative scores. And teams who real record and power ranking record are relative will have number near 0. So in summary, people with positive numbers are over achieving a bit while those with negative numbers are under achieving.
Anyway, I like stuff like this and was just hoping for more more ideas. I already do like a fantasy points per game for each player on peoples teams. I was looking for something that was more team based.
I was thinking I would do average margin or victory or margin of loss, but those sound kind of redundant to me.