To me, it seems like book is targeting players, when what people were wanting and expecting was a book targeting the gm or setting in general. But yeah, it's really not a great product, and probably should have been released as a free PDF companion for an actual setting release.
Furthermore, why would anyone expect an adventurer's guide to fill in for a full-blown campaign guide?I do have a question. Why would anyone expect a Sword Coast Adventurers Guide to detail anything other than the Sword Coast?
You just have to keep an eye out. I managed to score a copy that's in pretty good condition for like $30 a few months ago. Have they got pdfs of it on dndclassics?
.... It probably should have been 3-4 books. A full-blown FR book for those new to it, how its been updated, how things can be converted etc... A crunch book with new classes, races, feats, spells, essentially a PHB2. And possibly a campaign setting for FR.
But I think the book also demonstrates WOTC's long-term strategy regarding new materials, which may or may not be in their best interests, is to keep all new splat bundled with fluff. For a variety of reasons.
Why is it with every single release, the exact same people keep telling all and sundry how bad the book is? Good grief after over a year, if you have not liked a single 5e supplement, why on earth do you think you'll like the next one?
It is hardly just the usual suspects though. This looks to be the lowest reviewed book of 5e so far.
It's not the people that hate it that is the problem, it's the number of people who have just gone 'meh'.
WotC has made it quite clear that they have no intent of publishing a complete setting book for settings that are well detailed in one or more prior editions. The two big objections to that are 1) new players don't even know these settings exist or that they could look in previous editions and 2) crunch needs conversion.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.