How bad is it? It's pretty damn bad.
Should you see it? If you can find it (it's bootleg only) and you may have seen part of it before.
The story behind this film is better than the actual film. "Night Train to Terror" was made as an anthology of three films including what was an unfinished project that makes up the bulk of this film. The editing for the anthology tightens things up quite a bit, as the full unfinished film had a bit of new footage added and was released as "Scream Your Head Off," which was released on VHS without the knowledge of the director [I've seen that, too]. The director then decided to finish the film his own way, which became this film; unfortunately, his lead actor had visibly aged and he shot on video, which causes some glaring continuity problems.
The story, such as it is, has a guy drunk driving and causing his bride's death. He then attempts suicide, but awakes in a private hospital - or mansion, or something (it's all iffy) - where mind control and drugs force him to lure women into becoming sex slaves in the Mideast. Then there's the hospital attendant, played by Richard Moll (who has hair, unlike in his "Night Court" and later appearances, and who's billed as Charles Moll), who likes to chop people up. Then add a romance with a woman who claims to be Marilyn Monroe, played by Francine York (a nice touch of class), abducted 30 years earlier. Of course there's an escape and revenge, but less gore than in "Night Train to Terror." All in all, it's a trainwreck.