Okay, I've seen my fair share of 70's Italian crime movies... about half that exist I'd imagine, maybe a little less. The only ones worse than this are the ones from Mario Bianchi and Alfonso Brescia just because those are so campy. What really sinks this one is a very low budget. Everything seems awfully third-world, from the flatly shot dialog scenes, boring chases, and toned-down shootouts.
Not to mention the dubbing - by God, this has to be the worst dub-job I've ever seen on an Italian film! Borderline unwatchable had it not been so unintentionally funny. Take the scene where Sonia Viviani gets raped by Salvatore Billa for instance... the actress dubbing her voice is far less than convincing and just keeps calmly saying "no please let me go" about 16x in a row. I don't even think the dubbers actually watched the movie, as the plot points don't even make sense, and the comic relief provided by the lieutenant just confusing.
That said, this has a very good cast (Lastretti, Merenda, Murolo, Billa, and the genre regulars) and moves along fairly quickly with its fair share of violence. There's just a lot of better ones out there such as anything by Castellari, Lenzi, or even Stelvio Massi. This one looks more like a better-funded-than-usual student film.