Townsend's snarky tone is amusing to read, at times, though not always practical. His notion, for example, that an organization is just going to hire an ad agency and let that agency run whatever they want, no questions asked, no feedback incorporated, etc. That's not going to happen. It worked well for him and the Avis example, but generally speaking, that's just not how business works. He also has some downright weird opinions at times, such as that better marketing ideas will come out of doing "secluded getaways" with the team vs. consulting marketing experts. I think this displays a bit too much unnecessary hostility toward experienced and knowledgeable marketing people.
But there are also some good common sense opinions here, such as: brevity is generally better (such as when trying to convince a board), don't spend so much time on unnecessary documentation like fancy "corporate image" annual reports, the "Theory Y" style of management is generally better, be open to reviewing outside job offers with people and don't get possessive/emotional about it, have fewer meetings, etc. A quick and entertaining (for a business book) read.
I liked this one-liner: "Titles are a form of psychic compensation."