Disliking the theatrical cut of Justice League that was released in 2017 wouldn't exactly be seen as a contrarian take, but a high-ranking exec - former or otherwise - of the studio that distributed the movie in question admitting to thinking it's "terrible" is a little surprising!
Quotes from a July interview (via Bleeding Cool) with Diane Nelson have surfaced, and the former President of DC Entertainment admits that, during her time at Warner Bros., "there was never a thoughtful, well-controlled, confidential slate process" when it came to attempting to replicate the success of the Marvel Cinematic Universe, and she felt this was "the single biggest thing that made us look amateurish, certainly relative to Marvel, if not just on its own."
Nelson goes on to reveal that there was never any discussion about making Zack Snyder the "Kevin Feige" of the DCEU by tasking him with "leading the DC slate for any particular period of time."
Though Nelson does go on to say that she would have wanted Snyder on board as part of their stable of filmmakers, when it came to Justice League, there was a conscious effort to ensure the movie "was not too long and that there was an opportunity for more heart and humour."
When Snyder was forced to step away from the project, the studio decided to being in Avengers director Joss Whedon to complete the film, and the result was... not very successful.
"My characterization is Joss was a bit of a shiny penny during a time when they were looking for something shiny to grab onto. I mean, I thought the final film was terrible. I would have much preferred a darker-than-I-wanted or longer-than-I'd hoped-for Zack Snyder cut than the Frankenstein cut we got in theatres. The Trinity characters of Batman, Superman, and Wonder Woman should have, by any measure, blown any other superhero movie away, and they didn't."
Again, it would be difficult to find someone who would argue with Nelson's assessment of the movie, and the "Snyder Cut" of Justice League that was released in 2021 was a lot better-received.