It's rare that I finish (or even get very far) with an anime or manga that I end up hating, but it does happen from time to time. When it does, there's usually some sort of horrible reason associated with it, and in this case it was because of a recommendation from someone whose suggestions I have enjoyed in the past.
For anyone just starting the manga, I'll admit that "Wolf Guy" doesn't start off too poorly. It's never particularly great (or even a hair's breadth above "decent"), but it showed enough promise that I kept reading, waiting for the manga to improve. Things change suddenly with a very intense moment at school which dramatically shifts both the tone and plot direction of the manga. From there it continues to get worse, and worse, and worse, until we've hit rock bottom with just about everything bad about narrative. I read the last twenty chapters out of a kind of morbid curiosity over just how terrible "Wolf Guy" could get and how low it would go, and I never even expected or hoped for a moment of redemption. Yes, it is AGGRESSIVELY bad, a term I use exceptionally rarely.
I'd recommend this manga to no one, although people who exclusively enjoy ultra-violent seinens and who are not bothered at all by pedophilia or gang rape scenes lifted from bad hentai may have more tolerance than I did.