The Human Centipede (2009)

How bad is it? It's nauseating, disturbing and very cheap.
Should you see it? Yes, if you're not easily offended, but not because it's so-bad-it's-good.

This film has a cult following and deservedly so, as its cheapness actually works in its favor, something that films like The Blair Witch project tried for and, in my opinion, failed at. It's the story of a mad doctor sewing people together mouth to anus, creating one long digestive tract and a "human centipede" with 12 legs. The originality of that particular horror and all it entails is novel, except that I seem to recall a story of the same idea from the 1880's; stories of surgically creating circus freaks has been around almost as long as anaesthetics. There were two sequels, creating longer centipedes, but they lost the novelty and had to devote most of their screen time to acquiring victims; they should be avoided at all costs.

Howling II: Your Sister is a Werewolf (1985)

aka Howling II: Stirba, She-Bitch

How bad is it? Terrible, but not as bad as it's reputation purports.
Should you see it? Yes, if only for Sybil Danning's outfits.

There are people who put Philippe Mora in the collection of worst directors and usually use this film as their prime example. He's made some pretty good films as well as some awful ones and claims that he had no artistic control over this one and that he made up for it in (the adequate) Howling III. Christopher Lee plays a psychic wolf expert (just go with it) who teams up with a girl and her boyfriend to hunt for vampires, leading them to Transylvania, where their queen Sybil Danning, 10000 years old, is about to start a werewolf revolt. Danning's body is the main focus of the film and she wears the most jaw-dropping outfit of her career - and that's saying something - and also a fur body suit. She does a topless scene, for which she probably was paid about half of the film's budget, and the closing credits show it again with reaction shots.  The film has S&M wolves, werewolf orgies, a gargoyle-like monster and titanium bullets (mere silver won't work). The film has no energy, no style, no wit and even the transformations are given little screen time. Still, Danning's topless and that's why the film exists.

House of the Living Dead (1974)

aka Curse of the Dead, aka Doctor maniac, aka Kill, Baby, Kill

How bad is it? It's a slow, cheap, old-fashioned creepfest.
Should you see it? No. It has one very funny moment, but it takes forever to get there.

I think the overall poor ratings for this film come from people who expected that it would have zombies, but it's bad enough on its own (de)merits. A scientist on a South African plantation is performing experiments on animals, believing that their souls can be removed from their bodies. Eventually, he starts in on his family and fiancee. Almost nothing happens for more than an hour and then there's a climax that's quite remarkably silly, involving the spirit of a disembodied horse. Fast-forwarding might be a good idea.

House of the Dead (2003)

How bad is it? It's a Uwe Boll film based on a video game. That spells disaster.
Should you see it? NO!

I had this cued up before I realized what it was going to be and once I saw Uwe Boll was the director, it was too late. Five young people go to a huge party on an island inhabited by zombies. I've never played the game, but I'm assured that that makes no difference; this film just sucks (a little footage from the game itself doesn't look interesting, either). People ignore obvious signs and shoot zombies like it's another day at the office. There just happens to be an arsenal of weapons available, without explanation. The fight scenes are poorly staged, but rather than being comical, are just boring.

The Hottie & the Nottie (2008)

How bad is it? The only enjoyment one can get from it is from reading the reviews.
Should you see it? Not even if you're a Paris Hilton fan (there must be one somewhere).

The Hillz may be Paris Hilton's worst film, but this is the worst that someone might actually watch by accident. A guy goes in search of his grade school crush and finds that she will not date him until he finds a date for her ugly friend. The ugly makeup is beyond over-the-top besides being unbelievable. Of course, she gets a make-over and he then falls for her. The film's implausibility, particularly in the timing of events, is matched only by the number of loose ends and unfunny supposed jokes. This fails as a romantic comedy not just because of the dearth of humor, but because the romance doesn't work and the cliche's and stereotypes are overwhelming. The film attempts gross-out humor, but pulls back for a PG-13 rating and fails even at that.

Horror House on Highway 5 (1985)

How bad is it? Intentionally bizarre, it's also unintentionally awful.
Should you see it? It has a cult following, but I'm on the fence. Probably not.

Two crazy brothers, one with maggots in his brain, and their father who kills people while wearing a Richard Nixon mask, kidnap a college girl and terrorize her friends.The soundtrack is incredibly annoying and intrusive. There's rape, mayhem, drugs, Nazis and medical experiments. There's no coherent plot, no acting or direction and no conclusion; the film just ends. And, of course, it was remade a generation later as Horror House on Highway 6.

Homoti (1987)

How bad is it? It's not the worst Turkish E.T. rip-off I've seen, but that's a low standard.
Should you see it? It's tough to find and not really worth the effort.

Made a decade after most Turkish remakes of American films, this has better production values and even some CGI effects, though the film itself still has an amateurish feel to it. This has never had a distributor - at least not one I could find - and appears to have been made for the entertainment of those involved. A  newspaper reporter fakes UFO photos and then discovers a real spaceship with an alien from the planet Homo that has a head like E.T. and a butt like a rapper's girlfriend's. The reporter takes him home to his apartment complex, where we meet the reporter's mother and gay neighbor. The question is: will they try to help him get home or will they try to keep him for themselves? The answer isn't unexpected or involving.