[Skipbidder]

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He has accurate criticisms of basically every philosophical system that predated him.

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Could you please direct me to his accurate criticisms of British empiricism?

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Nobody really thought the way he did before him

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Sure they did. Insanity wasn't THAT rare.

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He's also arguably the most significant philosopher since Descartes (and it's hard to name a more significant one since him)

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You had better be quite good at argument. Perhaps you meant to say "Apart from David Hume, he's also arguably...".
You'll have to work hard to get in the top 5. If I get political philosophers, he isn't making the top ten.

Just in case I'd forgotten my Nietzsche over the last decade, I trotted out Copleston's History and Flew's Dictionary. An amusing quote from the latter: "In the English-speaking world Nietzsche has only rarely been considered an important philosopher. Instead, he is still popularly seen as, at best, an impressive aphorist whose psychological apercus partly anticipated the theories of Freud, and, at worst, as one of the latest and perhaps the most inflammatory of a long line of German opponents of the ideals of liberal enlightenment."