Are you serious? Did you see WCW after Bischoff was fired the first time? Garbage. 5,000 gimmick matches including a "Judy Bagwell On A Pole Match." WCW's parent company cut Nitro from 3 to 2 hours because of him. Did you know Russo wanted to put the World Title on Tank Abbot? Yeah, the 3 Count Fan.
Sure he did great with WWF, but everything there had to filter to Vince (which some stuff did get through (Beaver Cleavage)).
Also note, when WWE bought WCW, he was re-hired by WWE and then fired for wanting to completely re-do the WCW invasion.