Why was Skidoo widely regarded as a major failure in Otto Preminger's career?

The 1968 film Skidoo is widely regarded as a major failure in the career of Otto Preminger because it was universally panned by critics and is frequently cited as the worst motion picture he ever directed.1

Although the gangster comedy featured a notable cast—including Groucho Marx, Jackie Gleason, Frankie Avalon, Mickey Rooney, Carol Channing, and George Raft—the film marked a significant low point during a period of decline for the filmmaker's work.1