Excellent article...pitched just right for me. Like some of the other readers, I found that it required a little effort to understand, but that was to do with the subject matter rather than the style / language.
To go from Recursive CTE to HierarchyId, was a lot to chew, but it tasted great.
I'm sure I'm not alone in saying that I'm quite shocked by the tone of some of the earlier comments, and I hope it won't dissuade you from writing more articles.
Thanks,
David McKinney.