Just watched it last night for a first time. Guess I am a late bloomer when it comes to Argento.
Not as good as Opera but I found it to be more enjoyable than Tenebre and Inferno. Maybe on par with Suspiria. But what's up with overuse of Iron Maiden? Not that I dislike them but just completely out of place, IMO.
Even though many do state that this is Argento's weakest film, hopefully, only judged upon his other works by those people, no matter what he does, it's always a cut above everything else. This is definitely up there as one of my favourite films.
Yeah, I would strongly disagree that this is his weakest film. I think anyone who would call it that has never seen his Phantom of the Opera. Or Yellow. Or The Card Player. Or Trauma (though even that one has its moments).