The book keeps getting recommend on HN presumably by true fans of DOOM. Apart from a few brilliant bits scattered throughout, it was a disappointing read for me.
I liked the book because it was pretty fast paced and gave insights into the PC game industry of the '80s and '90s, which I didn't know anything about. The rest of it I feel like I enjoyed because I was a kid in the '90s who loved Doom and Quake.
As for me, I was quite a 'hardcore' gamer in the late 90s early 2000s. So it was interesting to read where the games that I've played came from, because they owe a lot to DOOM.
The first game I remember playing was Wolfenstein 3-D. Or well, my father played it mainly and I watched, and only occasionally dared to play it myself. So perhaps for me it was more the nostalgia of Wolfenstein rather than DOOM that did it :)
I always admired Carmack, even before reading the book. I could agree with the 'sociopath' sentiment though, but that doesn't diminish his genius in my opinion :)