I was a bit skeptical at first when I read the concept. However, as I watched it, it just drew me in. The series paces itself well, not too rushed or fillers. What is most interesting is the questions that are brought up in the series about humanity. That despite the Parasytes being deemed "monsters" they have the same right to live just as humans do.
The soundtrack is very "dubstep" in layman's terms, but not very over the top like Skrillex. I for one enjoy this as it is different from your usual anime music and they make use of it really well in certain parts.
Overall, for the manga being from the 90s, it is solid. Unless you're squeamish
What do you guys think about it?