Original: He wrestled in Mexico and Japan for several major professional wrestling promotions in the United States Guerrero wrestled in Extreme Championship Wrestling ( ECW ) , World Championship Wrestling ( WCW ) , and in World Wrestling Entertainment ( then WWF , later renamed to WWE ) .
Simplified: Despite Guerreros success and popularity , he had been one of many wrestlers that were upset at never being given a chance to be main event stars in WCW .