having drinking related traits is not that bad for a FM who acutally commands an army, he does not need management skills that much, if he either is so far away that conquered cities have to become allied states, or he is close enouth to send in a different FM.
and the only thing realy good about command stars, is that you don't have to fight evry battle on the battle map. but most enemy generals have simply too much stars to autofight and captains can be easily be defeated with one star or the mere presence of a FM