It is all-around the worst movie ever made. The script is horrible, the story doesn't even make any sense, the production is so bad that it is unrivaled even among C or D flicks, and in fact any other alphabet flicks.
And oh, the main actor (Bela Lugosi) died during filming, didn't really help.
Yeah but Plan 9 was bad in a funny way. How bad it was gave it cult classic status.
Agreed. I didn't even read the books and I hated it (normally, I find I only hate movies that slaughter the books). It seemed like they just did it for the special effects. I still want to get around to reading those books, though.