I understand completely what you mean, but I think this is a very narrow-minded view. Admittedly spaghettis have a distinct style, but holding that up as being "art" while dismissing other films for not being stylish enough means you will miss out on some truly great films. Other genres use different methods to convey their stories and they have impact of a different sort.
In addition, the term "exploitation" is quite broad in the sense that it encompasses a variety of genres. A lot of the most infamous exploitation films were appropriated by grindhouse cinemas, rather than made with those audiences in mind. Spaghetti westerns are not really exploitation films as they were never really pushed in the same way as other genres in grindhouse cinemas.
However, if you're looking for exploitation films with a similar visual impact to spaghetti westerns, you could try some of the "Chambara" films like the Lone Wolf and Cub series or the two Lady Snowblood films. Those Japanese films are visually stunning and filled with the kind of flair you're looking for.
Some of the "carsploitation" films also look amazing, but especially the epic Vanishing Point. And Mad Max of course.
The "giallo" genre has been mentioned, but it's true some of those films ooze style. It's of a different type to what you will find in spaghettis, but is breathtaking in its own way.
To be honest, I think there's a lot of great stuff to be found in other genres. I would suggest not making pointless comparisons with spaghettis and just try to enjoy stuff for what it is.