I'm going with 4 stars: I have nothing yet to compare it to re: subject matter, utility or accuracy, so all I can rate is "was it a good read for ME?" Yes, it was.
I think it's safe to assume that no one browsing through Barnes & Noble suddenly says "Wow! That book on Alzheimer's looks riveting, let me add that to my pile along with the new Jack Reacher and Stephen King novels." You don't buy a book on a disease unless you're starting a new journey into unfamiliar lands and you're desperate for any kind of roadmap.
I chose Learning to Speak as the first read from a pile because it "looks" like a simple primer: hopefully providing a good starting point of foundational knowledge and broad context, which can serve as an informational cornerstone upon which I can build.
From that lens, this book was a good (and perchance lucky) choice. Informative, easily digested and understood, and emotionally relatable, Learning is a good "Alzheimer's 101" book offering an introduction to the disease from the human, behavioral and care perspective. It provides helpful academic and personal examples of changes, behaviors, and coping mechanisms for patients and caregivers. In many ways (though not as complete), I am reminded of reading "What to Expect When You're Expecting": You're about to embark on a new course of life which is unknown, terrifying, and ultimately in which the life, care and well-being of another human being will be in your hands - what now???
It does NOT deal with medical causes, therapies or treatments. For this read that's a good thing: medical research and therapies change rapidly and it's impractical to commit it to a book. This read is not about the medicine, it's about the care.
Also of great help was the list of resources, support & educational groups, care & feeding suggestions, and additional research assets listed in the appendices. As a first read, I'd recommend it as a good starting point.