Great article, especially the part about the all-nighters. I was one of those who was smiling while reading it, so mission accomplished on that. As far as what you set out to explain, which is the "Hardcore" side of gaming, I think you succeeded. As others have mentioned, my girlfriend also points out that I look way too serious when I'm playing games. In my mind, I'm having a blast, but my expression is a stonewall. A funny thing is, I had a recent conversation with my girlfriend and she had mentioned to me, "I don't want to play with you because I'm afraid you will get mad at me if I'm not good enough to keep up with you." Its interesting how one person says it, and another person materializes it. I'm going to send this article to her, just to get my point across now.
However, I feel that you've made just a tad bit of a sweeping generalization. While some games that contain the utmost doom and gloom are quite compelling, there are still those games that will keep you up for hours on end without any of that stuff. Viva Pinata is a perfect example of this. Harvest Moon anyone? Or just trying to 100% Jak & Daxter, or Banjo-Kazooie.
I personally find the most endearing games (the ones that will keep me up all night) are ones that let you play the game co-op with a buddy. Gears of War 1&2 were played into the wee hours of the morning with a friend of mine. So, you got me on that one, at least...as far as the doom and gloom goes in those games.
All in all though, it was an enjoyable read, I hope to see more from you!