EA FIFA, while they are apt to miss on young players and players in lesser and lower leagues, does actually use professional staff along with season ticket holders to provide input on ratings, in addition to their statistical analysis.In addition to this, sites like sofifa allow fans that actually follow the players/teams to be able to comment on their pages with real info. That's why I'm skeptical of Badji, but pumped about Ring, even though Ring is lower rated
So basically, ratings are about as accurate as the data available from the team/league. So if a player isn't logging a lot of data, such as the young player and those on less followed teams in less followed leagues, the margin of error is obviously going to be a lot greater.
The most overrated players are always PL. Not sure how much of that is due to empirical issues and how much is sales strategy.
eta: Fantazma
http://www.espnfc.us/blog/espn-fc-u...blends-advanced-stats-and-subjective-scouting