What kind of criticism is "no need to have Dracula in space"? The novel is about other types of intelligence, and the question is whether a conscience is necessary for intelligence, a topic that in similar words is discussed every day on this same forum many times a day.
In the book there are normal humans, upgraded humans with severed emotions, there are absolute sociopaths that are still conscious, and there are intelligent aliens with no conscience at all. Were they supposed to be all different alien species? I prefer it this way, there's more variety.