The Measure of a Mystery Book

Just read a brief review in the front of a book I received as a gift yesterday. The book is The Darkening Field by William Ryan. The review excerpt is from the Times Literary Supplement (UK):

Ryan writes with narrative drive and urgency, real sense of place, and a central character who is conflicted, moral, and above all, likeable. Any one of these things is a rarity; the combination is whodunit heaven.

That is a very succinct description of what every mystery book fan does when reading a mystery: take a measure of the book. Not consciously, hopefully. If done consciously it may just be that there are too many tripping points in the book. But afterward, in the glow of “whodunit heaven,” the mystery book fan realizes the elements the author used to create the pleasure, and they boil down to those three.

Is there more than that?

For example, does the Grading Sheet recommended for mystery book fan discussion groups add more to the measurement of a mystery book, or does it just expand on the three main measures mentioned in the Times review? For reference:

1. Got my interest (A) in first few chapters and (B) kept it through to the end?
2. Plot solution: was it surprising? (Unexpected)
3. Plot solution: (A) was the ending credible? (B) Did the loose ends add up?
4. Plot overall provided good degree of suspense  / tension?
5. Good use of local setting?  (Accurate / specific enough to be fun / not overdone or distracting)
6. Dialogue was well done?  (True to character, convincing, and/or entertaining)
7. Character of sleuth(s) was likable, attractive, appealing, interesting, and/or admirable.
8. Other characters seemed real and engaging (not cartoonish / stereotypical / undeveloped)
9. Writing style was mature, flowed well.
10. It makes me want to read another book by this author as soon as possible.

What puts you into mystery book heaven?