Yep, excellent. I'll add that a good instructor is a good teacher. Teachers inspire students to want to learn, to focus and want to absorb what the instructor is putting out there. I've sat in classes with renown experts in their field that were so boring it was all you could do to make it through to the next break. Not everyone has teaching ability. I've been coached by some really good athletes in their own right, but they lacked the necessary teaching skills to be a good coach. I've experienced that personally as a student and co-taught/coached with some people that lacked the ability to communicate with the student or athlete on a level that caused the subject of the instruction to really want to dig into the material or presentation/practice session. Material must be relevant and meaningful, preparation matters, as does attitude and personality of the instructor.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.