I dont feel that horror movies needs to be very realistic, horror genre gives the freedom to explore the unrealistic beauty of our imagination. I find the movie good in that way. First story seems very realistic hence horror. Second story reminds me of my childhood dreams and my scary imaginations hence chilled my spine at moments. Third one is very well directed and whole world is praising this story, really very very fresh for indian cinema. Fourth one is weakest i guess because it was very very repeative, however have moments of scares due to music and visualisation.