After literally years of contemplation, we've finally settled on a formula for universal rankings, and behold they are born. mike89, RPG and sonicam hold the top spots.
The final formula is:
square root ( maximum game points / game charts ) * ( 10*(fractional percentage)^3 + leaderships + 2*championship)
...added for each game a competitor plays.
It's a bit complex, so I'll make a page explaining the effects, but the basic gist is that the way to get high points is to take the games you're already playing and push your percentage as high as possible. Playing new games will help your score, but not as much as getting really good in a few games, and popular games are worth more than unpopular ones.
Update: The numbers were slightly off. Fixed.