Most horror fans I know can't get enough of 70's and 80's horror (which decade is overall better, is, of course, disputed), but aside from a few select films (Psycho, Night of the Living Dead, the Hammer flicks), I don't see all that much talk about that many horror flicks pre-1970.
I'll just use my list of horror films I've seen, and post below a bunch of movies I think might be worth checking out. If anyone's seen any of them, and disagree (or agree), feel free to comment.
1913: Der Student von Prag
1919: Unheimliche Geschichten
1920: Das Cabinet des Dr. Caligari, Der Golem, wie er in die Welt kam
1921: Schloß Vogelöd
1922: Häxan
1925: Maciste all'inferno, The Phantom of the Opera
1926: The Magician
1927: The Unknown
1929: Seven Footprints to Satan, The Last Warning
1930: The Bat Whispers
1931: Dracula, Murder by the Clock, Svengali, The Drums of Jeopardy
1932: Doctor X, Island of Lost Souls, The Mask of Fu Manchu, The Monster Walks, The Most Dangerous Game, The Old Dark House, Vampyr, White Zombie
1933: Mystery of the Wax Museum, Secret of the Blue Room, The Invisible Man, The Vampire Bat
1934: The Ninth Guest
1935: Mad Love
1939: The Face at the Window, The Gorilla, The Hound of the Baskervilles
1940: The Devil Bat
1941: King of the Zombies, The Wolf Man (4)
1942: The Undying Monster
1943: The Leopard Man, The Mysterious Doctor
1945: Dead of Night, The Body Snatcher, The Picture of Dorian Gray
1946: Bedlam, The Beast with Five Fingers, The Mask of Diijon
1948: Bud Abbott Lou Costello Meet Frankenstein
1951: The Thing from Another World
1953: House of Wax
1954: Creature from the Black Lagoon, Them!
1955: Les diaboliques
1956: Indestructible Man, Invasion of the Body Snatchers, X the Unknown
1957: The Abominable Snowman, The Curse of Frankenstein, Zombies of Mora Tau
1958: Bijo to ekitai ningen, Dracula, Earth vs the Spider, How to Make a Monster, It! The Terror from Beyond Space, Macabre, The Blob, The Fly, The Screaming Skull
1959: A Bucket of Blood, Attack of the Giant Leeches, House on Haunted Hill, The Bat, The Four Skulls of Jonathan Drake, The Hound of the Baskervilles, The Killer Shrews, The Mummy, The Tingler, Tôkaidô Yotsuya kaidan
1960: Psycho, The Flesh and the Fiends, The Hypnotic Eye, The Little Shop of Horrors, 13 Ghosts
1961: Bloodlust!, Mr. Sardonicus, Pit and the Pendulum, The Innocents
1962: What Ever Happened to Baby Jane?
1963: Blood Feast, Dementia 13, Lo spettro, Matango, Paranoiac, The Birds, The Haunted Palace, The Haunting, The Sadist
1964: À Meia Noite Levarei Sua Alma, Hush...Hush, Sweet Charlotte, The Curse of the Living Corpse, The Flesh Eaters, The Last Man on Earth, The Strangler, Two Thousand Maniacs!, 6 donne per l'assassino
1965: A Study in Terror, Amanti d'oltretomba, Terrore nello spazio
1966: The Plague of the Zombies, The Reptile
1967: Berserk, Esta Noite Encarnarei no Teu Cadáver, Frankenstein Created Woman
1968: Confessions of a Psycho Cat, Hasta el viento tiene miedo, Witchfinder General
1969: The Oblong Box, What Ever Happened to Aunt Alice?
Not every movie above is amazing, but I did enjoy each one to varying degrees.
I have a deep love of many of these older flicks, and if anyone wants any recommendations, maybe we can all help each other out.
I'm a bigger fan of 70's/80's/90's cinema. Psycho is okay and I used to watch the Blob movies a little but that's about as far as I go into enjoying older movies like these.
70's and 80's horror flicks are, for the most part, amazing. I always slightly preferred the 1970's, but both are very strong decades of horror.
90's, while there are some more modern day classics within, not so much.
I get it, though - it's not the easiest thing to get into older movies. Personally, there's tons of silent horror movies I love, but I rarely expect other horror fans to willingly jump into them.
Psycho is a great movie, but there are plenty of other classics to if you look. That said, I certainly understand the preference of 70's through 90's horror flicks.