Variable. A writer in the Sci Fi/Horror sub-genre can lean more heavily on the Sci Fi side, grounded in a believable scientific reality, or more to the horror side, containing more supernatural elements. As such, the level of science can vary greatly.

Variable. When the aim of a sub-genre is the evocation of fear grand ideas and social implications can fall by the wayside. On the other hand, a well-written story will make a reader feel and then think about that fear so that the emotional catharsis readers may feel itself becomes social commentary. For example, a common storyline in the Sci Fi/Horror sub-genre is that of facing the other (e.g. aliens, Communists, women, etc.) this story can have very little social implication and just reinforce the values of superiority or it can open up a wider discussion on why we fear the other.

Variable. Stock characters are sometimes used in Sci Fi/Horror stories, merely vehicles that allow the reader to feel fear. The cross-genre nature of this sub-genre may also give rise to characters who are well developed and have realistic motivations and internal lives.

Variable. Sci Fi/Horror plots tend to be well-woven sequences of cause and effect to maximize the reader's sense of horror. However, plot can also take a back seat to world-building or characterization so that setting and/or characters evoke the sense of horror instead.

High. It's called horror for a reason. Granted, some horror stories can be horrors of the mind and therefore not include much physical violence, nonetheless there is still something severe in the story that possess qualities of violence.