People are only going to learn to copy by your tutorials. They are good on instruction of shading but do little to teach the novice about the actual structure and reason for why something looks the way it does. With no understanding comes little effect!
I totally agree with everything you said. A tutorial is where you explain to others what exactly you're doing - if you learn from something like this, you'll just learn to copy, which makes it harder to let your creative side come out.
Though this drawing style is really awesome! I just wish there was some explanation.