Sorry, the story telling is incredible! Just listen to Mr Bernstein talk about the girl he saw on the Staten Island Ferry.
Might have to do with when you saw the movie. I saw it as a kid on the late show and I had never heard of it. Not sure I had ever heard of Welles. Just blown away. It blew my fragile little mind. Subsequently very pleased to find that people considered it a classic.
Maybe if you read/hear all the hype first and then see the movie, you don't appreciate it as much.