Review Detail of Not_Fun_ in My system allows me to copy talents

Grammar is extremely awkward, characters reactions and actions are extremely over-the-top, dialogue/thoughts are very cringy, and the main character is supposed to be a 27 year old GROWN MAN in the body of a 5 yo kid, but acts and thinks just like a child would. His mother is initially portrayed as this amazing woman that stayed with him when everybody else didn't (in his previous life), but she just comes off as an abusive and aggressive person. First thing she does in the story is to "Furiously yell" at her 5yo son and hit in the face because he committed the horrible crime of forgetting to brush his teeth before breakfast. She then proceeds to keep "Angrily yelling" at her son and husband. It is also mentioned that these beating are very common in their household.His dad... well, honestly the dad is very normal.The MC is a child. Literally and figuratively. He's supposed to be a fully grown man, but has extremely childish actions. He arrived at school and got 'In a trance' after seeing the beautiful young lady at the door, blushing as she smiled at him, forgetting to talk/move (27yo btw). He then proceeds to get lost on his thoughts while his coach is talking, only responding to him when another kids nudges him on the shoulder, which results on him being on the bench. The writing and pace of the story are strange. The writing seems rushed while the starting plot is full of filler, creating this big contrast that just doesn't really work for me.