I read it so many times when I was in my teens and 20s. I juggle between the three I mentioned above as my top favorite. I didn't know it was a Mary Sue fic. I'd never even heard the term until I discovered the world on online fandoms less than two years ago. I think the series that defines Mary Sue for me is one written by a woman named Laurall K. Hamilton. She's been so blatant that even I picked up on it before I knew what to call it.

I'm assuming the Mary Sue character was Evan Wilson.