Most overrated and underrated political philosophers?

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Overrated: Montesquieu. The separation of powers he extolled in practice amounted to the rights of minor aristocrats to rule petty fiefdoms and entrenched powers to run rampant and unchecked. In general (obviously not always, don't @ me with counterexamples), common people have far more to fear from local despots rather than supposed all-powerful tyrants who, for all their flaws, have to at least govern taking everybody into account. It's no wonder that he found his origins in the Parlements of the ancien regime, the aristocratic institutions who consistently blew up all royal attempts to get the house in order by claiming this itself was tyranny, an obstinacy that would completely blow up in their faces in the Revolution. Moreover, his influence on states all over the world has been largely counterproductive: constitutions jammed fill with checks and balances and heavily separated powers are no less unlikely to be led by tyrants than states without; the idea that all branches of government jealously guard their own privileges against the other leading to a neat equilibrium is one that is not seen in reality.

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talking of overrated French philosphers: Voltaire. dear god.