I think he was a good boss, his downfall was having a few outsiders in the family. He should have cut them loose. That was his other problem, he was not in tune with the changing times and with what was going on inside his own family among a couple of factions. Gravano was as much his downfall as Gotti. If they had followed his lead and been like him they survive, and Gotti does not die in prison, Gravano likely does not turn rat and give everyone up. Maybe he was great as a boss till the last few years, then he became too isolated.