... The Starting Out books are generally fewer than 200 pages, and fairly heavy in wordy explanations. (KindaSpongey doesn't seem to notice that the people he quotes are often at odds with each other. Willy Hendrix considers this to be a serious flaw in opening books.) ...
"... Maybe this warning against the study of openings especially focuses on 'merely learning moves'. But almost all opening books and DVD's give ample attention to general plans and developing schemes, typical tactics, whole games, and so on. ..." - IM Willy Hendriks (2012)
... Most chess authors who write opening books aim their books at competitive club players and above. Such players are far above the average chess player.
"... For inexperienced players, I think the model that bases opening discussions on more or less complete games that are fully annotated, though with a main focus on the opening and early middlegame, is the ideal. ..." - FM Carsten Hansen (2010)
"... Everyman Chess has started a new series aimed at those who want to understand the basics of an opening, i.e., the not-yet-so-strong players. ... I imagine [there] will be a long series based on the premise of bringing the basic ideas of an opening to the reader through plenty of introductory text, game annotations, hints, plans and much more. ..." - FM Carsten Hansen (2002)
https://web.archive.org/web/20140627055734/http://www.chesscafe.com/text/hansen38.pdf
Unsurprisingly, I agree with my friend, Carsten Hansen. There's a paradox for chess authors in that the people who will benefit most from opening books are too few to make them worth printing, so authors actually rely on people for whom the books are too advanced in order to make ends meet.
Everyman Chess has published some very interesting opening book series, including the "Starting Out" series. The Starting Out books are generally fewer than 200 pages, and fairly heavy in wordy explanations. (KindaSpongey doesn't seem to notice that the people he quotes are often at odds with each other. Willy Hendrix considers this to be a serious flaw in opening books.)
The "Move by Move" series is for more serious players, and may attract readers rated up to 2500. But they are not really designed for top flight use, and probably are only marginally helpful for correspondence chess. John Emms is probably my favorite "Move by Move" author.
But as Carsten Hansen pointed out, and as I mentioned elsewhere, studying complete games that are well annotated is a better use of time for most players.
Again, even the "Starting Out" series is geared towards players who already know something about chess and are probably already above average strength! But also, the opening chess book industry relies on people overestimating their strength and who like to buy opening books even if they would be better off buying good game collections.