I cannot force myself to lie in an aut-bene-aut-nihil manner and say that he was the nicest person ever, merely hindered by some mental problems. Much of his behavior in the old days of the "Web Reviewing Community" was frankly disruptive and inexcusable in a nasty way, mental illness or not. That said, (a) I don't really have any reason to think that the nasty things he did on the Web extended to any other part of his or anybody else's life and (b) to the best of my knowledge, he never did anything bad to anybody in the past 15-18 years or so, so obviously bygones be bygones.
I think his biggest problem, really, was that he never managed to properly find himself in life (something, I guess, we all struggle to do, but some of us are mentally stronger than others to withstand the pain). He wrote decent reviews that didn't really stand out much from anybody else's, and semi-decent poetry which never stood any competitive chance. He probably realized that deep down inside himself, but he couldn't cope with it, which resulted in his endless self-aggrandizing paeons that annoyed the hell out of everybody. And while some people used that as an excuse to mock or bully the poor guy, or might have occasionally just been harsher on him than necessary (I know I probably was a few times over the years, so sorry, Adrian), like Mark says below in the comments, he was most likely beyond genuine help (at least over the Internet) - as in, telling him the truth to his face was definitely not an option. I suppose that whatever happened in the end was ultimately inevitable.
It's good to read below that his reviews helped out quite a few people - this means he'll keep on living in some of their hearts for a while yet. For myself, he is more of a memory (good and bad) of the good-old-days when amateur music reviews were still a hot thing on the Internet and we could even be heroes just for one day, pretending that the "Web Reviewing Community" would at one time drown the Rock'n'Roll Hall of Fame in a giant river of... never mind. He wasn't exactly the Brian Jones/Syd Barrett item in that group of people, more like a Brian Jones-lookalike, but he was certainly... special. As in, Casey Brennan, who also passed away recently, was definitely much nicer and hardly any less talented as a writer, but Adrian will probably stick in my memory for much longer, for good or bad.”