I had to rate the collection as "so-so" because of, well, it being a collection. Some of Fleming's shorts simply don't hit the mark, or they seem to fizzle without coming to much of a point.
If judged solely on the titular story, "A Quantum of Solace," the rating would be different. This is my favorite Bond tale, even if it is among the most atypical. No action, just one man telling Bond a story. Absolutely love it.