SHOW US A director who never created at least one genuine turkey of a movie, and we'll show you a director with an extremely short career. There's simply too many things that can go wrong once a movie goes into production: The budget can get slashed, filming might start before the script is finalized, key actors could drop out, and the studio could meddle in all sorts of irksome ways.
That's why titans of cinema like Martin Scorsese, Francis Ford Coppola, Steven Spielgerg, James Cameron, and Ridley Scott all have at least one movie they wish they could erase from their IMDB page. Some of them were made when they were young novices without any real ability to say no. Some of them were made at the peak of their powers when they made horrid bad decisions out of greed, hubris, or temporary insanity. And many were shot in the waning days of their careers when getting a green light for any project was difficult.