There's such a huge catalogue of bad horror that it's difficult to single out specific entries. But in the last few years, Stephen King's ROSE RED stands out as a monument to poor filmmaking, characterization, casting, storytelling, pacing, acting, you name it.... I ended up turning it off halfway through, afraid that I might be arrested for criminal wasting of time if I left it on.
And speaking of STIGMATA, I'd include it in about the same category. It was a movie that tried very hard to disguise the fact that its whole premise was worse than flawed from the get-go....
Some of the timeless classics of terrible horror (and/or sci-fi) include the following (in no particular order):
THE GIANT CLAW: Features the ugliest puppet turkey-buzzard you'll ever see anywhere.
THE CREEPING TERROR: Stars the famous walking carpet that eats underpaid extras. Due to a lost and/or unusable soundtrack, the whole movie was narrated, to infuriating effect. The sound of the monster's roar was somebody twisting the dial of a short-wave radio.
THE GIANT SPIDER INVASION: The title character is a Volkswagen in a giant spider costume, which parades through a small town eating underpaid extras.
GOKE--BODY SNATCHER FROM HELL: A Japanese attempt at soul-searing horror that, with a 110-minute running time, runs 109 minutes too long. The original Japanese soundtrack is nothing to brag upon, but the English dubbed version is downright painful.
BARBARELLA: I have tried no less than a dozen times to watch this movie. I've never made it for more than 30 minutes at a sitting.
Every FRIDAY THE 13TH movie, except perhaps the first one, and it's iffy.
Every Michael Myers movie, except the first HALLOWEEN, which is a minor classic.
Every CHILD'S PLAY movie.
Every 1980s rip-off slasher film.
Every 1990s rip-off slasher film.
I do not include the NIGHTMARE ON ELM STREET movies, even though some of them stink worse than a week-old corpse; the first one was almost OK, and a couple of the follow-ups have their moments.
And on and on.... There are more entries than could ever be listed here....
There are a lot of "bad" or "cheesy" horror flicks that I love, though. Sometimes it's a fine line between being awful and being fun. A lot of low-budget movies that don't take themselves seriously can be hugely entertaining, even though by any objective criteria they hardly hold water. Some of my personal favorites in this category include the following:
BARON BLOOD
THE BLOB
COUNT YORGA, VAMPIRE / RETURN OF COUNT YORGA
THE CRATER LAKE MONSTER
THE DUNWICH HORROR
FROGS
FROM BEYOND
THE GREEN SLIME
KRONOS
THE LEGEND OF BOGGY CREEK
THE LEGEND OF HILLBILLY JOHN
THE MONOLITH MONSTERS
THE MONSTER FROM BLACK LAKE
MONSTER ON THE CAMPUS
PHANTASM (including sequels)
REANIMATOR
RETURN OF THE LIVING DEAD (including sequels)
SASQUATCH--THE LEGEND OF BIGFOOT
TEENAGERS FROM OUTER SPACE
WILLARD
And on and on.... Again, there are so many here that I could wear myself out just thinking about them. ;)
Your mileage may vary...
[shadow=maroon,left,300]--Mark[/shadow]