It's a terrific game with a very compelling story that I think is worth experiencing. If you thought the first three chapters were rough, though...
I'll be honest: it gets worse. A LOT worse. I've been a horror fanatic since I was little, and my family loves gore films, so nothing in the first three chapters really bothered me much. The last two chapters are incredibly dark, though. Chapter 4 in particular ends on a scene that makes you feel hopeless and is astonishingly cruel. The excellent sound design sells it all, of course.