Having read both JKR's and K Stock's reviews, I am struck by how reasonable they are - they both stick to the facts, analysing how NS's claims and perceptions are not borne out by what actually happened.
While the word 'excoriating' has been used of the reviews, they are not nasty or 'below the belt' - literally, as neither has focused on the easy target of NS's comments on her sexuality.
There have been accusations that the reactions here have been motivated by 'hatred' of NS. I'm reading more anger and disappointment than hatred, but yeah, I get it - some posters really really can't stand her! But because of what she has done, or failed to do, not because of what she is. If she is called 'a liar' it's because she has made claims that can be proven to be untrue - that's fact-checking, not hatred.
Both JKR and KS have, I think, been meticulous in basing their reviews on NS's political career, and writing style, rather than ad feminam attacks on her as a person.
JKR's sweary annotation of her copy of NS's book stands as proof of how she controlled her emotional response and wrote a carefully factual review..
My only comment on the book which I don't think I'll ever read is about the title - did nobody realise that the title, Frankly, was going to be automatically followed up in many minds with '..my dear, I don't give a damn'