Reviews ratings are pretty simple.
Five Star System for all: 1 star = Come on Man!, 2 stars = Neither here nor there, 3 stars = Very Good, 4 stars = Outstanding, 5 stars = Speechless.
Creativity: The basic premise behind the story. If an old, often rehashed, theme (zombies, vampires) what new twist revives it?
Spelling and Grammar: Not that I believe that spelling and grammar are critical to the story, but it distracts many readers.
Execution: If the idea was good, it does not mean that it was executed well. If the idea was poor, it does not mean that it wasn’t well executed.
Page Turning: Did I fall asleep, or stay up?
Overall: Totality of the Circumstances