WCW was pretty dead in the water when Russo showed up. Did he not do a horrific job surely so and his influence in wrestling over the years has changed the business not for the better you could say but........Kevin Nash basically killed WCW dead just that simple. Russo's work in TNA has been ungodly bad so that seals his fate on this list but you can't discount Nash as the worst booker ever.
To Loss' point though, how much blame should Heyman get in changing the wrestling business from what it used to be for decades to what it has become now. ECW was the original Crash TV format and you can say that Russo basically ripped off Heyman doing it his own way with help of course.