Thank you for reminding me to watch this one. I do think Parasite skated that perfect line between accessible Hollywood fodder and high-quality indie arthouse film, which is partly what drove its success. There was nothing "quiet" about that movie, but it was unique while still speaking directly to class issues, which we so rarely see now especially in SJW-oriented films.
Speaking of Asian cinema, I suggest Audition, Ichi the Killer and The Handmaiden. The Asians aren't afraid to go full-throttle.
And speaking of horrifying, if you've got a really strong stomach for extra-depressing World War II movies involving kids, the two most disturbing I've seen that also are likely among the most "realistic" about war and human depravity are The Painted Bird and the excellent, lesser-known Soviet War film Come and See.