I remember being profoundly disturbed by Walk or Die as a kid. I re-read it recently though, and it was kind of shit. I suppose it just wasn't written with a middle-aged 21st century readership in mind.
I have very fond memories of Bloodfang, the collected edition ('floppy' in modern parlance, I suppose) of which my mam bought for me when I was ill. I re-read it many times over the years; and enjoyed it every time - the sheer viciousness and lack of any human presence made it kind of unique for me. It's probably still in my parents' attic; I'll have a hunt for it sometime.