First of all there is a common misconception among the people who hated this movie. "It wasn't scary at all". True, it wasn't scary and that's because IT'S NOT A HORROR MOVIE. Pennywise the clown is a supernatural phenomenon/creature that comes alive every 27 years and feeds on the fear of children to kidnap them for the long hibernation until IT's next arrival. The movie is a Thriller/Drama with Horror and Fantasy elements.
The movie is very well made with and the chemistry between the LOSERS is impeccable. Every child actor is simply top notch and Finn Wolfhard(Richie) of Stranger Things fame, easily steals the show. He is absolutely hillarious. The movie is filled with creepy and terrifying moments with a right balance of emotion, friendship and love. "IT" takes pieces from the best thrillers like Shining, Sixth Sense and uses little or no jump scares and it's neatly done.