Soccer (futbol) refereeing is far more sketchy than football. In addition to the normal complaints about incompetence that all sports fans have about referees, you have the added corruption. People bitch about the refereeing the in Super Bowl, and justifiably so, but no one seriously thinks the refs are trying to give the game to a particular team (at least no one rational). Moreover, you have fans so rabid (and devoid of sense) that they make Raider Fan look like your average girl scout.
I don't know what may have led to Brett retiring. Green Bay will still be strong next year, and what I've seen of Aaron Rodgers is that he's *gasp* good. I still can't help but feel that Favre will be playing next season, somehow.