I seem to give a lot of books four stars instead of five due to lacklustre endings. "It" is another one of these. 
 "It" is a very, very thick book and I have to give King credit for being able to keep the story together as well as he did for so long, but it amazes me that the book managed to stay so strong for so long and then suddenly just collapse into a messy heap at the end. 
 I don't actually have the moral problems with the bizarre sex scene towards the end that many people have, but I do find it confusing, distracting and unneeded. It doesn't add anything at all to the book and the way King tries to make it fit the plot is like a toddler insisting that a round peg will fit a square hole if just a little more brute force is used. I would love to know what exactly the point of it was supposed to be. It's just weird. 
 Several things about the end of the book are weird and, ultimately, disappointing, but it deserves a solid four stars because until the end the book is brilliant and some of the most fun I've had reading a horror novel.