There were so many wrong decisions made during the background process of the film. They said that it would be the first horror movie of the MCU, that it would be a dark movie, and they shot a movie that was childish even compared to the MCU average.

What is most serious and needs to be talked about is that a movie that should have a critical place in the larger MCU story continuity is completely irrelevant. The movie is about multiverses, the whole new phase of the mcu was about multiverses. Doctor Strange seemed to be one of the most critical and popular characters to be positioned at the center of the new phase. And they wrote a completely unrelated story arc. Even if the actor playing Khan did not put the final nail in the coffin, this was a move that was seriously damaging to the new phase.

Regardless of all this, the scenario is simple and of poor quality. Another serious mistake is to say that you have made a very ambitious movie about multiverses, but then put in only one meaningful parallel universe and a few less visible parallel universes. With such a brand and budget, they had to feed us on parallel universes. The movie offers nothing in this regard other than a parallel universe adorned with excessive fanservice.

During the script writing phase, it was clear that this film would be a huge failure, and there was no material that could be salvaged during the shooting phase.