Was Nehru Worst Indian Prime Minister?

We got our independence in 1947 and just after a short period of 15 years (winters of 1962) Prime Minister Nehru made a public address on All India Radio in which he stated "Freedom is in peril. Defend it with all your might." It was during China war.

So if we think about it in a dispassionate manner, what kind of governance did Nehru provide to the nation that our freedom was in danger in just 15 years, all over again?

Can there be any bigger crime by the person who is sitting at the helm of affairs of government, to let his country come close to enslavement? Judging him by this alone, Nehru should be judged as the worst PM of India so far.

Add to this his inept and disastrous handling of Tibet and Kashmir, Nehru further cements his position in this ignominious position.

Will our school books teach us the truth?