How bad is it? It's a passable B-movie, with poor special effects, but better than most Bert I. Gordon films.
Should you see it? It's amusing in small doses, so yes.
John Hoyt overacts as a lonely doll maker who shrinks people and stores them in glass tubes and then occasionally brings them out to play. John Agar takes a date to see "The Amazing Colossal Man" (another Gordon film I'll review on this blog) before he gets miniaturized. When he and five others get revived, there's dancing and champagne and a girl takes a bath in a coffee can and one of the girls actually likes the life they lead, but Agar won't have it and destroys a Dr. Jeckyll marionette before starting a revolt. They run into expected problems with their new stature - a now giant dog, for example - before they rescue themselves.