He’s asking if it matures later on. OP feels like the writing they’ve encountered so far is not directed towards adults, so he’s asking people who have read it if it’s worth continuing.

If the book is consistent throughout, the answer is no. If the book matures in style later on, the answer is likely yes.

HP did the genius move of maturing the writing with the reader. It started YA, but I’m not sure I can say it stayed there by the end.