The best bosses are the ones who behave more like businessmen (Castellano, Gambino,...). In that respect Gotti was absolutely terrible.
On the other hand, as a gangster Gotti was terrific. A natural leader, tough, loyal with an ability to make tons of money. You can say what you want about him, but the guy had balls and was a gangster through and through. As a Capo he would've been good at what he did.