One of the more entertaining topics at the Criticker Forums is an extended study on the Best “So Bad It’s Good” films. Although applying the word “best” to any of these films is a serious stretch…
Truth or Dare: A Critical Madness was suggested by fudgieb — kudos to anyone who can watch that video without laughing (I broke at 1:36). There are a lot of other gems in this 4-page thread, and plenty of video evidence of exquisite suckery.

You don’t have to see the poster for Samurai Cop to know that it’s going to blow … but TheDenizen uploaded it, so that we could all be sure. Still, it might have the best tagline ever.
Anaconda, American Commando Ninja, Silent Night Deadly Night 2 (“Garbage Day!”), and of course The Alternate and Rollerball, which TheAlliance highlighted in the topic’s first post. There are a lot of stinking, shit-covered treasures here. Can you add to the pile?

Santa’s Slay, The Gingerdead Man, Decadent Evil, Cradle 2 the Grave, Blood Car
The video doesn’t work anymore… And my submission didn’t make it to the post
Strange… the video works for me? And we surely didn’t mean to neglect Scorcher! It looks great! I mean terrible.
…
No, I mean great! And your review of it makes it sound even better.