To fully enjoy many of the gialli I've seen recently, the viewer must, as I call it, take a "leap of logic". What I mean is that if the viewer were to stop and think about how illogical things in the movie were, they probably wouldn't enjoy the movie as much. Well, with Spasmo the viewer is asked to take a Grand Canyon size leap of logic. The problem is, I only made it half way across. The illogical actions and reactions the character make throughout the movie ruined much of my enjoyment. When faced with a situation, in almost every instance the characters act and react in the most illogical manner possible in order to advance the storyline. A logical decision by any character at any time would have brought the movie to a screeching halt.
That's not to say that there weren't things I liked about the movie. The latex dummies hanging from trees were a nice touch. The way the murders are shown in flashback at the end of the movie was a fairly innovative idea. But, there weren't enough of these moments.
The acting is what you would expect. The score by Morricone, while good, is not one of his best. The revelation of the murderer is by far the best part of the movie. The DVD from Shriek Show is a mixed bag - good picture, but lots of hiss in spots on the soundtrack.
Overall, this is not one of the better gialli I've seen. If you want to see a far superior giallo by Lenzi, see Seven Blood-Stained Orchids. For what it's worth, I'll give Spasmo 5/10.