I liked his exposition of the psychological endurings of a young, sexless, autistic male and the literary style was decent. My main takeaway from reading him was how I need to kick my own ass and give up or integrate my own vulnerable narcissism leanings. But I do think he was a Malignant Narcissist though, more than anything else.
Envy, fear, resentment, these things came up constantly in his writing and I resonated with part of it. Of course if I had been there that day in Isla Vista I would have just tackled him to the ground, lol. He was a monster, but a suffering monster. That's the interesting thing about monsters, they're human too. We cannot just get rid of them, as they are us.