I was at 1990 worlds, and Holly Cook was an absolute joy to watch. I remember that during the figures she did one figure that was superb, and as she skated over to her coach, this huge beaming smile emerged as she realized that she'd really done well and that she'd done it at Worlds. And then during the short and the long she was so thrilled and excited.
She was so happy to be there, and the audience loved her because she was so happy. From what I was told, she was very level-headed about winning a medal. She knew she had worked hard to get to that level, but she really didn't expect to do that well, and she was grateful. And her ego didn't get blown out of proportion by suddenly becoming a medallist. She was gracious and kind to the event volunteers, the arena staff, and anyone who congratulated her or asked for an autograph.
So yes, she was an unlikely medallist and didn't have the best programs ever at Worlds, but IMO she would be the first to agree with that.