Let's see...
Good:
-Dark City: One of the best darn psychological horror/thriller films ever made. Go watch it.
-Videodrome: Incredibly strange, and often horrifying. It also happens to have one of the most interesting messages and themes I have yet encountered in a film.
-The Dark Knight: Simply put, best super-hero movie ever. Go watch it if you haven't yet.
-The Shining: Expertly filmed and paced, filled to the brim with symbols and metaphors, and relentlessly bleak. Also happens to be my favorite horror film of all time.
-Big Trouble in Little China: The best film from one of my favorite directors. Everybody needs to watch this movie.
Bad:
-The Wicker Man (original): The only good moment is at the end. Every thing else is either painful, or out of place.
-Pirahna: No redeeming value whatsoever. Terribly unlikable characters? Check. Generic plot filled with cliches? Check. A variety of moments that make you want to stab you eyes? Check.
-From Beyond: The Go-to movie to see Lovecraft done horribly, horribly wrong.
-Cthulhu Mansion: One Word: Dull.
Strange:
-Eraserhead: A man on vacation has to take care of his hideously deformed child after his girlfriend leaves him. Then things get very, very strange...
-City of Lost Children: Ron Perlman is a strongman who has to save his little brother from a scientist who cannot dream. An army of clones, Siamese twins, and a brain in a jar are also involved.
-The Naked Lunch: An exterminator gets addicted to the stuff he kills roaches with. He then gets recruited into a secret society by a bug that is also a typewriter. Things go progressively downhill from there.
-Phantasm: A tall, pale mortician takes dead bodies, squishes them into midgets, then sends them to a hell dimension to serve as slave labor. A boy, his brother, and there friend, an ice-cream man, have to stop them.