Seriously.. if you didn't/don't enjoy this movie, it's because you take life way too seriously. Yeah, the movie is campy as hell. It's not meant to be a big budget, hollywood horror fest. It's a cheesy, campy, low budget, b-movie good time. It's comical. It's fun. It's entertaining. If you are looking for serious... try the news networks. You'll get plenty of horror there.
My one and only complaint is the same complaint that I have for most every single movie made post-2000... BUY A LIGHT BULB! And I don't want to hear that this is supposed to be "back in the day" before they had electric lights. First, movies set in this era have been made for decades and they were lit perfectly fine, thank you very much! Secondly, there are literally electric lights in Dr. Frankenstein's laboratory. Most of the movie is so dark, you might as well close your eyes and you'd still get the same effect.
Other than that, if you are just looking for a good movie night flick, you could do much worse!