I read one as a boy, it was interesting but as an adult, nah, no way, it would insult my intelligence (take that as you will). James Bond was the same, must have damn near read the lot of them and watched the movies, but today, nah, or as you say “crapfest” for sure.
Also for an insight into what was considered shocking back in the 40s and 50s. It is a counterpoint to real literature like Hammett and the Philip Marlowe books and stories.
Pulp fiction is like science fiction - some of it is as good as any other literature ever written. Some of it is just bug-eyed monsters and beautiful women and ray guns.
It is like a vacation to a world where all problems are simple, and the protagonist (like Mike Hammer) can just shoot and slug his way to the end. It doesn’t pretend to be anything but what it is, and that is a kind of innocence that can be appealing. It is adolescent, no doubt about that, but there is a good big part of me that never grew out of my teens.