Bad ending decision. *spoiler*
Given what happened, & what he did to her, why the Hell didn't they have the Scottish woman (who we never saw killed!) come back as a wolf & kill the nasty guy?!
Having Joe turned was too downbeat, tainted his sacrifice & just wasn't satisfying, whereas all those problems would be avoided...and end more vengefully satisfying...if reveal had been the Scottish woman getting him.
So yet again in a modern horror film, a silly decision weakens the movie right at the end.