Two and a half stars.
As Facebook and Goodreads ate up all my updates, I'll reiterate in my review.
The book itself has a naturalistic or other kinds of fallacy on every page of it, in essence, one is shocked that at some point in time its contents were considered anything but creative fiction.
Hayek, as any second-tier philosopher remains prisoner of his time, upbringing, and personal history, thus considering the ideas of rules and justice through a personal lens of a child of the well-off parents who experienced a breakdown of an empire first-hand without understanding the premises of this breakdown.
The books contains only 3 worthwhile ideas, unfortunately none of which are original in their nature - the first, being that rules create unintended consequences and that the behavior of a complex system depends as much on those unintended consequences, as on the intended ones, which is well-known in the domain of systems engineering and is truly the only novel idea, the second idea being that the judiciary and the attorneys serve to interpret and modify the rules and law in order to attain desired outcome without breaking the tacit order too much, so the order they create is not of thse 'public' or institutional nature, something which was known to the Greeks and any civilisation which had formalised law before, and unsurprising coming from Hayek who was a legal sholar, also something which is well-studied and formalized now in the domain of metagaming, and some mitigation attempts have been made by using a source code version control system as a consistency check for the existing legislatures and precedents, in Belgium and Germany. The third idea being that the natuaral private law arose as a minimal set of rules for the social functioning, which is again true.
On the other hand , everything else in the book, is false and dogmatic, false and fantasy-induced or just plain wrong.
"Natural" laws and the human rights are something precious and fundamental precisely because they are not axiomatic, but theorematic - they are fundamentally provable both empirically and logically (the opposite of Hayek's assumptions).
The private property is not "sacred" because of some wisdom of ages or divine providence or because it is better than common property - and that's where Hayek fails to follow his own logic - it is, the most optimal structure of property considering the degree of advancement of the human society and the degree of evolution of the human ape at the time of invention of the private property - common property is ideal, but simply not for humans as they are now - the people, as a whole of Mankind, are very simply not resource-intelligent enough to understand the need to balance the equation of the biosphere . Therefore - the private property is the lesser of evils (the alretnative being for the most poor, uneducated and unorganized people - unlimited proliferation and the destruction of the commons), for the time being. Same goes for the special group interests - all legislature is made in name of the special groups, simply because we live in a society which identifies by groups (again because we are apes), so consequently the struggle for or against legislatures is in 99% of cases - the struggle of the special groups against each other, which includes the dearest to Hayek "natural" property owners. Again, he does not follow his own logic to the end here.
The rest of the book can be subsumed as just bad science fiction writing. As is, I would say that Hayek has done more harm than good both for liberalism and mankind, by achieving notoriety.
I really hope that in the Age of Big Data, this kind of writing will be relegated to the past.