These Rankings continue to be a source of debate. Personally, I think that it is good to have a world football ranking system, but I challenge the way FIFA does theirs. They use a number of variables such as strength of the region - CONCACAF vs UEFA, match importance - friendy vs WCQ, socreline etc.
The type of match has a large wieght on the points.
I think that they should not count friendlies into the system.
A lot of teams send B squads or very under strength teams
If anything, more global competitions would give a better assesment of rank from region to region. like expanding the Confederations cup to include more teams.