So Bad, It's Good: Horrendously corny, but the terrible effects and cheesiness make it entertaining.
Special Effect Failure: Averted by The Thing's costume, which is actually pretty good considering the budget of the film (The fact that the company that did creatures on Babylon 5 made it too, helps). Played agonizingly straight everywhere else though, as most of the special effects come in the form of stock footage, cheap optical effects, and really terrible CGI.
One of Reed's stretching scenes clearly involves two gloves on the ends of sticks.
Suspiciously Similar Song: Eric and David Wurst's score is essentially slight alterations of many popular John Williams pieces.
They Just Didn't Care: Averted in the case of the cast and crew, according to the upcoming documentary Doomed: The Untold Story of Roger Corman's "The Fantastic Four". Roger Corman, as usual, got the film done on time and under budget, and though it's rife with corner-cutting leading to multiple Special Effects Failures, the Thing costume was actually rather convincing, some of the acting is genuinely compelling, and the film did have a story. In this case, it was their bosses, the executives of The Constantin Film Company, who just didn't care: they weren't planning on releasing the film anyway since it was just an Ash Can Copy to help them keep the movie rights until they could sell them to Fox for a hefty sum, so what did it matter what went into it?
Vindicated by History: It was originally considered by fans to be a mere B-movie with a healthy dosage of Narm and They Just Didn't Care. But now with how bad the 2015 movie is considered, this version of the Fantastic Four is being recognized by fans in a more positive light in comparison, considering that it seems like the makers of this one cared more than the makers of the 2015 reboot. It is also considered closest a Fantastic Four movie has come to matching it's source material in many ways.