How bad is it? It's woefully shoddy.
Should you see it? Yes.
Oddly proportioned Irish McCalla (reportedly 39-24-37, but doesn't really look it), soon to be TV's "Sheena," is shipwrecked with a few others on an island where a Nazi doctor tries to make his wife beautiful by mangling beautiful women (in truly jaw-droppingly awful makeup) and keeping them in cages. The ugly women dance, there's a volcanic eruption, they escape and exact punishment and the good guys get away. Most of that action is in the last minutes; most of the film is very slow-moving.