4.5 stars. 
 UGH--I learned an off-topic lesson today. Don't start writing a review on Goodreads in the morning, realize you need to leave for work so you put your PC to sleep, then come back in the afternoon and keep writing, finally click 'save', and then...nothing happens. Yep, I should have copied my review somewhere else, for my original is gone forever, which means my motivation to recreate it has greatly lessened. I'll try to hit the main points. 
 My Friend Dahmer is a powerful, haunting book. The kind that gets under your skin and stays there for a while after you've finished reading it. The artwork combines very well with the writing to a degree that I'm sure if this was not a graphic novel, it wouldn't have had the same effect on me. 
 Yet the title is misleading, for Derf and Dahmer were not really friends. Derf made fun of Dahmer, and excluded him from interacting with his real friends. Dahmer was included a bit, though mostly to provide amusement for Derf and his true buddies. 
 Some might not like Derf's slant, either. Derf's point of view is that Dahmer was failed by all the adults (parents, teachers, etc.) in his life. Maybe if one of them would have gotten Dahmer some help, he wouldn't have committed those horrible acts. I don't know, and I was fine with this telling of the story. Derf did extensive research, and I urge readers to not skip the preface, which helps explain his slant. Derf also provides many sources in the back, plus a short (drawn) epilogue.