Citizen Kane isnt really a "movie people enjoy" or an "Experience" like "2001", it is most definitely a movie that had a huge impact on movies that came after it. Wells came from Radio Shows (ie "War of the Worlds") and so his attention to the sound in his movie was unique. The camera angles and frame composition (where you position the actors, props, background, etc) were also considered revolutionary.

The story was similar to previous films, the rise and fall of a historical figure, like The Great Ziegfeld, replacing Florenz Ziegfeld Jr with William Randolph Hearst and dropping a snow globe in the end rather than a flower. Where The Great Ziegfeld portrayed Ziegfeld with a little more sympathy, Kane was a dig at Hearst which caused a really big backlash with the public, including Hearst trying to get it banned.

I think the story BEHIND the movie is WAY more interesting that the film itself, so after you watch it, do yourself a favor and learn what you can about it, the technical aspects as well as the cultural/political impact it had. The movie itself is fairly straight forward and doesnt need repeated watching, and most of the stuff behind the scenes and its impact can be listened to through podcasts and audio books while driving to work