I THINK Al Pacino was occasionally trying to do a Southern Accent and still sound like Al Pacino, only I think he kept forgetting to do one, and you only hear it in some scenes. WTH Al?
Anyway, you have seen this before, many times, only this time the killer is playing a game of hangman and that is his weird MO, like Se7en, only much lamer. It's like January Man only not as fun. It just doesn't add anything to the trope filled genre, and doesn't really have an interesting story to tell.
So... the result is a subpar film with two good actors doing poor jobs, a story that doesn't add anything to the genre, least of all entertainment, and a setting that is filmed so dark they didn't need much set design and the cinematographer only needed to meter to one kind of light.
Dark alone isn't moody, it's just dark, you have to add a bit of atmosphere to it.
So I'd tell you to stay away. There are certainly worse films out there, but they are going to be more memorable than this.