I've often found that managers tend to be as good as the team they are given. The "best" coaches and managers in sports tend to have the best teams. What I find to be amazing is when coaches win things like coach of the year awards and then are fired two years later because they suddenly become a crappy coach. At the end of the day, your initial thought that managers in baseball have the least effect of any in sports. They are highly paid scapegoats.