Maybe I'm just crazy here, but I didn't even really think it was about D&D. I mean, they played D&D and all, but it was more a story about sadness, loss, and, really, the losers.
He doesn't like playing in Eric's group has nothing to do with the system, or how the game was run. In the context of the story, Eric's game IS better, and this has nothing to do with GM styles or anything. It's the fact that the people our protagonist is playing with are normal, middle-of-the-road people... which is not what draws him to the game.
I dunno. My two cents.