Many people like to say that the book is poorly structured, dense and elusive. Maybe, but all to a purpose. Wittgenstein understood the role that structure at a larger level could play in communication, so he treated the flow of the book very deliberately. His subject here is not agreeable to a strict format, and his goal is not to pontificate.
This book blossoms out into many different areas. Saul Kripke was inspired, or "struck" as he phrased it, to write On Rules and Private Language by PI, and Paul Feyerabend's Against Method bears its distinctive traces, intellectually and stylistically. These works pull very different directions, but they both are stained heavily by Wittgenstein. PI has borne fruit across a sweeping expanse of thought. For me, it has been a fermentative experience, and the variety of interesting bits on the mind, rule following, culture, language, and meaning still re-emerge in different contexts as I go here and there. Whether you treat him as a skeptic or as proposing an original philosophical method (and some tidbits), a dedicated reading of this book is incredibly stimulating and rewarding, if you are willing to try to digest and apply these ideas beyond the reading itself. It challenges our preconceived notions and forces us to think deeply about the nature of language, thought, and reality. The book is not an easy read, but the effort invested in understanding it is well worth it. It can open up new perspectives and help us to see the world in a different light.