There is this subjective ranking http://m.espn.go.com/nba/story?storyId= ... rc=desktop
And there has been objective draft rating. But has anyone tried a detailed & comprehensive executive rating to include trades and free agency using objective metrics? In the analytics wave, understandably nearly all the focus has been on players. But attention to coaches and GM would seem logical and perhaps a source of unique edge against the field, the potentially leveling field.