Works that deal with interesting concepts can be truly fascinating. They have the power to demolish some of the very silly thinking that people intuitively bring to the subject of the philosophy of language. This is no small feat. On the other hand, the author in question is perhaps a bit more than supportably behaviorist. With an annoying frequency, he confuses something that he can't find out with something that is unknowable by definition. He seems to ignore the fact that science has indeed taken what were once philosophical problems and transformed them into experimentally answerable questions. Cog sci, quantum physics, and relativity are especially good examples on that front.
That being said, it is still a great introduction to Wittgenstein. One has to remember that there actually were people who thought in the way that his seeming strawmen did. This provides valuable context and helps to understand the significance of his work.