Well, the problem with calling a movie deep for its visuals and score alone is that the visuals and music of a movie are surface level details. What's beneath that? What's the message? What deeper meaning do the visuals and music serve? For a movie to be "deep" it must have a profound message, and teach you a lot about life, because that is the bar that people like Tarkovsky set. What was Susperia's message? As far as I can tell, it didn't have one.
Having a message doesn't make a film deep. A school pamphlet about the dangers of crossing a road without looking both ways first has a message but wouldn't be considered deep.
And just because people by default call images 'surface level' doesn't mean they can't have depth. Suspiria has ideas about filmmaking, about the subconscious, about how images and music can combined to engage and disorient. It is full of provocations about what is real and what isn't. It reinvents the basic idea of how a horror film operates. These things have depth because they can be talked about at length and with deep analysis that could fill books.
Basically the whole idea that 'style over substance' means a film is nothing but an empty vehicle for surface pleasures and thrills is total nonsense that I reject completely out of hand.
But for all the praise that Susperia's visuals get, the cinematography was actually quite poor, with a lot of boring shots, awkwardly framed shots, and awkward camera placements.
Dude, don't even. How these shots are framed and composed, how the camera moves, where the camera is placed are exactly where many of the films ideas can be found. Maybe if they listened to you when they made it and didn't put the camera in all those 'awkward' places, then maybe the movie might not have anything to offer beyond its violence. And there isn't a single boring shot in the entire film. If one is worried about forward momentum regarding the story, that admittedly frequently stalls, and as a vehicle for storytelling Suspiria could probably pretty fairly be described as a failure. And so maybe that is what you mean by boring, because the story sometimes is. But....**** stories? Suspiria is better than that.
I don't get the position that Susperia isn't Giallo, like why not? It checks every box.
-Italian Produced
-Murder Mystery Horror
-Mysterious killer revealed in the final act
That's not every box. Also giallo's generally don't deal with the supernatural. And who cares what googling gets you. That just means a lot of other people misidentify the film (personally, I don't care if it's considered giallo or not, and I hate stuffing things into genres and subgenres....but by most standard definitions Suspiria really isn't one)