I have no idea what these people above saw, but I think I laughed three times and just at the last third of the movie.
What I think was really bad is the timing of the jokes and basically the nonsense of them to happen. I mean, you can predict them before they happen and the punchline never hits. So, I watched a serie of jokes poorly delivered that I already knew how they could develop largely haed. Also, there is no continuity, they seems just thrown off randomly. There is never a joke that serves for another one to follow and building layers; Literally just a serie of scenes that are taped together.
Actors are badly directed, and in a way I can't imagine how could it be to try to deliver with this bad script.

Such a disappointment, considering Young Frankenstein is one of my favourite comedy movie, but that one has consistency and it's a well executed idea. Now that I'm thinking about it I think the timing is a bit off in that movie too, but at least the jokes are sort of natural and you feel they serve the movie even in scenes like the candle one.