There's a weird thing with movies these days that when a bunch of critics call it the greatest movie of all time, you're an idiot if you don't like it. Trust me on this; you're not an idiot if you don't like Citizen Kane.
My biggest problem with this movie is that I don't give a shit. I really don't. Throughout the entire movie, I was just asking myself, "Why should I care about any of these people?" Kane's an asshole, and that's fine. No one ever said main characters had to be nice. But normally when a main character is an asshole, I should still be invested. At least a little.
Why should I care about Kane? Because he died alone? So what? He deserved it. Because he wasn't born an asshole, but it was a result of his upbringing? So? There's only one scene of him being halfway decent, and that's when he was a kid.
Kane's a ridiculously static character, which I consider a serious problem in a character study. Nothing changes Kane; he's always an asshole. The only thing that changes is his environment and how the public views him.
I have other problems with this movie, too. Some of the actors in the smaller supporting roles just give performances that can only be described as goofy. The newsreel at the beginning of the film pretty much spells out the entire plot, leaving nothing to the imagination. The crux of the film is reliant on a plot hole.
It's a well-made movie, but GREATEST movie ever? Not by a long shot. "12 Angry Men." "Casablanca." "Lawrence of Arabia." THOSE are movies that live up to the hype. Citizen Kane? Not so much.
Anyway, that's just my opinion, so flame me if you want.