If I recall, his first two books are pretty okay since they are just telling his story and the history of Singapore, etc. However, it is from his perspective so when you reach the part of his struggles against his various enemies, take it with a grain of salt and think carefully about his assertions that his enemies were so cunning, etc, etc. I mean, if they were really that good or merciless, why were they not victorious? And if they were that, what does it say about him?
*Chuckles*
His "hard truths" book reveals the extent of his own prejudices, biases and personal demons and I think the only thing I took away from it is not to be aware at all times and not fall into the trap of self-rationalisation. One of the greatest exercise of self-rationalisation was when he decided to expound on the reasons why the Scandinavian and various European countries are successful despite choosing a completely different path from the other Western nations (especially the United States) and why that way will not work in Singapore.
I mean, my only thought was "Wow, did you really need to go on such a tangent to justify your own actions?"