All this adulation causes newbies (typically young people) to cringe when they finally get to see the actual movie. Shock! Horror! It's in B&W.
The trailer for Citizen Kane is less a sales pitch than a mystery. It shows plenty about the people behind the making of the movie but nothing from the actual film. Based solely on the trailer, you don’t know what Kane is about, short of being about a shadowy, complicated character called Kane.
Welles wasn’t just being cagey for the sake of building audience interest. He was trying to head off a fight. Though Welles publicly claimed that Kane was not about media baron William Randolph Hearst, you can hardly blame the tycoon for feeling otherwise. Hearst was a newspaper magnate with a showgirl mistress who built himself a preposterously opulent castle. Citizen Kane is about a newspaper magnate with a showgirl wife who built himself a preposterously opulent castle.
Hearst did everything he could to stop the movie’s production – and he could do quite a lot. When he failed to kill the picture by pressuring the studio, he pressured theater owners. He used his media empire to slander Welles – using the director’s complicated personal life as tabloid fodder and even implying that he was a Communist. Hearst’s campaign to discredit Welles was so successful that when the director’s name came up during the 1942 Academy Awards, it elicited boos.
If you want to get a sense of just why Citizen Kane is revered then check out this exhaustive documentary below about the film.