My criticism is around how often the book is recommended. Many people want to learn HOW to become a manager. Manager's Path doesn't provide that.

Conversely, a lot of people recommend An Elegant Puzzle. Great book, but I would not recommend it to first time managers – it's too advanced.

Elegant Puzzle is for experienced managers, specifically people that are managing Managers. Check it out if you're 2+ years into their management career.