How bad is it? It's rather dull.
Should you see it? Only if you can find the original Japanese film from 1955.
Japanese horror films got re-edited and repackaged for American audiences, like Gojiro becoming Godzilla, King of the Monsters. This one, about the abominable snowman in northern Japan, had about 40 minutes cut out and then 20 minutes of footage was added that consisted of John Carradine talking - endlessly - to others, including Morris Ankrum, about what happened. The original footage had the music changed and Carradine's narration layered over it. The film is interminably dull, even though it lasts but an hour. The original version of the film has been pulled from circulation due to unsubtle racism against the Ainu people.