The frequency at which MDN docs are linked in StackOverflow JavaScript answers shows that people are getting more familiar with them. PromoteJS took off recently and it has helped too.
The trouble with Mozilla's docs is that they are really bad about distinguishing between cross-browser compatible JavaScript and Mozilla's own implementation. For example, the reference you linked there includes the let-statement. The only disclaimer in Mozilla's docs is that it's part of "JavaScript 1.7," which would lead you to believe it's part of a recent language standard that modern browsers are likely to support. In fact, "JavaScript 1.X" where X > 5 is code for "Firefox-only."
The first thing I noticed was "noobstories" being marked Advanced. It is probably because noobs are trying their best to get karma by submitting some advanced stories.
The Catcher in the Rye by J.D.Salinger because of the Holden Caulfield in me who couldn't tolerate all the phoniness around.
Also enjoyed The Man Who Knew Infinity by Robert Kanigel. After reading about Hardy in this book, I have read "A Mathematician's Apology" which was excellent too.