Well, I know that too formal of a writing style can confuse me, so I prefer a more casual tone to the story. I want to read a story and have it keep me on the edge of my seat, and excite me throughout the whole experience. Books to me do not always have to include a moral, or a lesson to them. Reading to me is a source of entertainment. For example, the novel I read in 4th grade, Gregor and the Curse of the Warmbloods, was so original and odd, yet thrilling and exciting. I like when a story gets to the action considerably quickly. I usually give up on a story if it takes too long to build up.
I hope this helps in some way, or at least inspires you. Have a great day!