A good PM is an great asset that adds huge value to a company. Most are middling middle managing bean counters.

Advice on how to make sure you become the former and not the later would be more useful than this blog post.

I think the real problem is the company you work for as a PM. What kind of projects you are working on, who is actually holding the purse strings, who the clients are (internally or externally) etc. I know project managers who are boss hog and ones who are little more than account managers with a title. TINSTAAFL.