Went through dozens of recommendation posts on this sub and compiled every underrated horror/thriller/mystery/sci-fi / vagera vagera and Here's the list.
I kept seeing the same type of posts every other day "suggest me something underrated" "best thriller on netflix?" "horror recommendations?" so claude went through old recommendation threads on this sub, claude read hundreds of comments, and pulled out every movie and series that bot users actually recommended in the horror, thriller, mystery, and sci-fi genres.
No rankings. Just an alphabetical list
Annihilation, ARQ, Arrival, Barbarian, Bird Box, Black Swan, Buried, Coherence, Dabbe, Exam, Exhuma, Forgotten (Korean), Get Out, Gone Girl, Hereditary, I Saw the Devil, Identity, In the Shadow of the Moon, Incantation, Knives Out, Mama, Memories of Murder, Midsommar, No Country for Old Men, Oldboy, Phone Booth, Prisoners, A Quiet Place, Ready or Not, Shutter Island, Split, Super 8, Talk to Me, The Call (Korean), The Chaser, The Invisible Guest, The Mist, The Others, The Ritual, The Sixth Sense, The Wailing, Train to Busan, Upgrade
Series:
12 Monkeys, 1899, Alice in Borderland, All of Us Are Dead, Archive 81, Behind Her Eyes, Black Mirror, Brand New Cherry Flavor, Clickbait, Dark, Dark Matter, Dept Q, Devs, Don't Come Home, Fall of the House of Usher, Fringe, From, Ghoul, Haunting of Bly Manor, Haunting of Hill House, His & Hers, Kaala Paani, Locke & Key, Lost, Love Death and Robots, Mandala Murders, Marianne, Midnight Mass, Mindhunter, Person of Interest, Severance, Supernatural, Teacup, The Chestnut Man, The Expanse, The OA, The Outsider, The Sinner, The Watcher, Three Body Problem, True Detective, Twin Peaks, Westworld
Hope this helps someone.