Do not read any of the propaganda. It's all opinion. Your ears hear differently than anyone else's. Don't forget that and just trust them. If you read anything, read the forums here on the Gon.
Harley's book is pretty matter-of-fact about foundational information and vocabulary, etc. It is not without some share of the author's opinions, though they are few and far between and so far from the point that I'd wonder why anyone would suggest it might be "propoganda" (perhaps that poster was referring to something else though). I'd certainly agree with the point that this stuff is entirely subjective as far as performance, and heartily applaud the advice to trust your own ears. But I'm not sure why I'd trust any of these Bozos posting here, myself included, over any other resource that portends 'experience'. I say take it all with a pound of salt and test the waters yourself with your personal interpretation of the best of those indications at your disposal. But truly, Harley's book is mostly informational, IMO, and is a very good basic resource.
Marco