How bad is it? A slow Poverty Row monster movie.
Should you see it? If you run across it. It's watchable.
Neither as good nor as bad as one might hope, this was on MST3K and I've seen it several times without their commentary as well. George Zucco plays a mad scientist, as usual, who injects wolf blood into his handyman Glenn Strange, turning him into a sort of werewolf. When not a monster, Strange seems to be parodying Lenny from "Of Mice and Men." It's so cheap that most of the action happens off-screen and what you do see is poorly done. It's pretty typical of cheap monster movies of the time, but it has long dull stretches, with just a few silly moments.