We've had quite a few questions regarding the new Foosworld rating, i'll try and respond here:
The Foosworld rating is based on a combination of all major (and many regional) ustsa and ifp events from the past several years. This includes all non-handicapped, non-specialty events. This includes draws, pro-ams, and limited events. Points are adjusted for each match (using Player ratings at the time of the match), and then tallied at the end of each tournament.
For doubles the strength of each player on the team is accounted for - by this I mean that winning with a lower-rated partner will gain more points than winning with a higher-rated player. So for the doubles rating, the ability of a player to win with varying levels of partners is rewarded. For example if I played Open Doubles with Terry and he wins the event, he would gain much more in points than if he had played with Todd and won. This is why a player like Ron Olson has such a high doubles rating, he beats high-rated teams frequently with lower-rated partners.
The Foosworld rating arguably gives the most accurate representation of Tornado player strength to date, however keep in mind that all rating systems are flawed to some degree. Since there's still not enough match data, some player ratings may be off. And of course a higher rating doesn't guarantee victory over a lower rated player. When it comes down to a match numbers are just numbers, and some players just match up well against certain styles of players.
Hope this answers some questions, just let us know if anyone has other questions, comments or suggestions.