In creating tutorials, the key is exercising restraint.
This is especially important when dealing with Emacs, which is a classic case of an almost complete lack of restraint concerning the hierarchical organization of features. EmacsWiki is another great example of a huge tangled ball of knots.
Most experts forget exactly how impenetrable a new subject can seem to a beginner. I commend the tutor for not forgetting this!
I'm trying to balance out the two and spent quite a while trying to tease out stuff that's not too superficial but at the same time is not too deep for beginners to follow.
Like most of these things, it's going to be impossible to please everyone but if there is a sizeable fraction of people who find this useful, I think it's served its purpose.
As for me, thinking through the whole thing in advance, trying stuff out and preparing the material helps me clarify my own knowledge.