Real rating: 5.2/10
Manga/GN rating: 6.9/10
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Parasyte starts like a hundred other sci-fi horror stories with alien/monsters suddenly appearing and mimicking the human populace. Like most of these works there is an underlining philosophy or metaphor and the author has no qualms with bashing your frontal lobe with this philosophy time and time again.
The story is interesting in the beginning but does fall in spots where it becomes a little too stereotypical as well there are numerous storyline starts that seem to fade away without any progression or even consideration after their initial construction.
What ultimately ruins parasyte from being a higher level work is the victory over what one would dubbed the final boss. It is on par with war of the worlds or signs. The hero does not win it is a simple mistake or error that turns a build up of at least three hundred pages into nothing but another shot of the author trying to drum home the philosophy of the work, like a heavy handed version of King Kong's finale.